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1360–1431 · Medieval · Carmelites

Dom Nuno Álvares Pereira, OCarm , known as Constable of Portugal, was a Portuguese general who played a decisive role in the 1383–1385 Crisis that assured Portugal's independence from Castile.

1150–1204 · Medieval · Benedictines

Obitius (Italian: Sant'Obizio) (February 4, c. 1150 - December 6, c. 1204) was an Italian saint. He was born in Niardo, in the province of Brescia, around 1150 (tradition holds that the day was February 4).

958 · Medieval · Benedictines

Oda (or Odo; died 958) the Good was a 10th-century Archbishop of Canterbury in England. The son of a Danish invader, Oda became Bishop of Ramsbury before 928.

662–720 · Medieval · Benedictines

Odile of Alsace, also known as Odilia and Ottilia, born c. 662 – c. 720 at Mont Sainte-Odile), is a saint venerated in the Eastern Orthodox Church and the Roman Catholic Church. She is a patroness saint of good eyesight and of the region of Alsace.

960–1049 · Medieval · Benedictines

Odilo of Cluny (c. 962 – 1 January 1049) was the 5th Benedictine Abbot of Cluny, succeeding Mayeul and holding the post for around 54 years. During his tenure Cluny became the most important monastery in western Europe.

801–881 · Medieval · Benedictines

Odo I (or Eudes I) was a West Frankish prelate who served as abbot of Corbie in the 850s and as bishop of Beauvais from around 860 until his death in 881. He was a courtier and a diplomat, going on missions to East Francia and the Holy See.

1100–1113 · Medieval · Benedictines

Odo of Tournai, also known as Odoardus or Odo of Orléans (1060–1113), was a Benedictine monk, scholar and bishop of Cambrai (from 1105/6). Odo was born at Orléans. In 1087 he was invited by the canons of Tournai to teach in that city, and there soon won a great reputation.

878–942 · Medieval · Benedictines

Odo of Cluny (French: Odon) (c. 878 – 18 November 942) was the second abbot of Cluny. Born to a noble family, he served as a page at the court of Aquitaine. He became a canon of the Church of St. Martin in Tours and continued his education in Paris under Remigius of Auxerre.

1105–1198 · Medieval · Carthusian Order

Odo of Novara (c. 1105 – 14 January 1200) was an Italian Catholic priest and a professed member from the Carthusians. Pope Pius IX confirmed his beatification in mid-1859.

1286–1331 · Medieval · Order of Friars Minor

Odoric of Pordenone (c. 1280 – 14 January 1331) was a Franciscan friar and missionary explorer from Friuli in northeast Italy. He journeyed through India, Sumatra, Java, and China, where he spent three years in the imperial capital of Khanbaliq (now Beijing).

750–865 · Medieval · Benedictines

Odwulf of Evesham (or Odulf, Odulph, Odulfo, Odulphus; died 855) was a ninth century saint, monk and Frisian missionary. Odwulf is recorded in the medieval Secgan hagiography the Medieval Hagiography of Saint Ecgwine and the Ave presul glorioseI Augustine psalter, where he is li…

700–709 · Medieval

Offa was King of Essex. D. H. Kirby dates his reign as 705 to 709. Simon Keynes dates it c.694 to 709, when he went on a pilgrimage to Rome, where he died as a monk, along with Cenred, King of Mercia. He may have been co-king with Swæfred.

995–1030 · Medieval

Saint Olaf (c. 995 – 29 July 1030), also called Olaf the Holy, Olaf II, Olaf Haraldsson, and Olaf the Stout or "Large", was King of Norway from 1015 to 1028.

1060–1137 · Medieval

Olegarius Bonestruga (from Germanic Oldegar, Latin: Ollegarius, Oligarius, Catalan: Oleguer, Spanish: Olegario; 1060 – 6 March 1137) was the Bishop of Barcelona from 1116 and Archbishop of Tarragona from 1118 until his death.

890–969 · Medieval

Olga (Church Slavonic: Ольга; Old Norse: Helga; c. 890–925 – 11 July 969) was a regent of Kievan Rus' for her son Sviatoslav from 945 until 957. Following her baptism, Olga took the name Elenа.

950–1050 · Medieval · Benedictines

Saint Oliver of Ancona - also known as Oliver of Portonuovo, Oliverius or Liberius (died c. 1050), is a saint of the Catholic and Orthodox Christian churches. His feast day is 3 February.

1150 · Medieval

Onisim of the Caves (Ukrainian: Онисим затвірник Печерський) (fl. 12th–13th century) was a monk of Kyiv Pechersk Lavra, buried at the Near Caves.

770 · Medieval · Benedictines

Opportuna of Montreuil (died 770) was a Frankish Benedictine nun and abbess. A Vita et miracula Sanctae Opportunae was written within a century of her death (c. 885–88) by Adalhelm (later rendered Adelin), bishop of Séez, who believed he owed his life and his see to Opportuna.

450–563 · Medieval

Oran or Odran (Old Irish: Odrán, Irish: Odhrán; Latin: Otteranus, hence sometimes Otteran; died AD 548), by tradition a descendant of Conall Gulban, was a companion of Saint Columba in Iona, and the first Christian to be buried on that island.

1101–1238 · Medieval · Poor Clares

Blessed Ortolana of Assisi (sometimes spelled Hortulana, born in the 12th century – 2 January 1238 in Assisi) – blessed of the Catholic Church, she is known as a nun of The Order of Saint Clare (Poor Clares).

698–750 · Medieval

Osana was a Northumbrian princess, whose local following as a saint developed informally after her death, though she was never officially canonised.

655 · Medieval

Osgyth (or Osyth; died c. 700 AD) was a Mercian noblewoman and prioress, venerated as an English saint since the 8th century, from soon after her death. She is primarily commemorated in the village of St Osyth, in Essex, near Colchester.

1380 · Medieval

Rodion Oslyabya (Russian: Родион Ослябя; monastic name: Andrey or Rodion; secular name: Roman; died 1380 or after 1398) was a Russian monk from the Trinity Lavra of Sergius of Radonezh who became famous for his part in the Battle of Kulikovo.

1100–1099 · Medieval

Osmund (died 3 December 1099), Count of Sées, was a Norman noble and clergyman. Following the Norman conquest of England, he served as Lord Chancellor (c. 1070–1078) and as the second bishop of Salisbury, or Old Sarum.

604–642 · Medieval

Oswald was King of Northumbria from 634 until his death, and is venerated as a saint, of whom there was a particular cult in the Middle Ages. Oswald was the son of Æthelfrith of Bernicia and Acha of Deira and came to rule after spending a period in exile.

1000–992 · Medieval · Benedictines

Oswald of Worcester (died 29 February 992) was Archbishop of York from 972 to his death in 992. He was of Danish ancestry, but brought up by his uncle, Oda of Canterbury, who sent him to France to the abbey of Fleury to become a monk.

650–651 · Medieval

Oswine, Oswin or Osuine (died 20 August 651) was a King of Deira in northern England. Oswine succeeded King Oswald of Northumbria, probably around the year 644, after Oswald's death at the Battle of Maserfield. Oswine was the son of Osric.

1060–1122 · Medieval

Saint Odo of Urgell (Catalan: Ot, Odó or Dot Spanish: Odón) (c. 1065 – 1122) was a bishop of Urgell, noted for his care for the poor. He was from the family of the counts of Pallars Sobirà. He is buried in the monastery of Santa Maria de Gerri.

689–759 · Medieval · Benedictines

Othmar, (also Audomar, c. 689 – c. 759) was a Medieval monk and priest. He served as the first abbot of the Abbey of St. Gall, a Benedictine monastery near where the city of St. Gallen, now in Switzerland, developed.

1241 · Medieval · Franciscans

Oton of Pula (late 12th century or early 13th century – 14 December 1241) was a Franciscan priest active in Istria. Medieval sources attribute to him many miraculous healings.

1060–1139 · Medieval

Otto of Bamberg (1060 or 1061 – 30 June 1139) was a German missionary and papal legate who converted much of medieval Pomerania to Christianity. He was the bishop of Bamberg from 1102 until his death. He was canonized in 1189.

1111–1158 · Medieval · Cistercians

Otto of Freising (Latin: Otto Frisingensis; c. 1111 – 22 September 1158) was a German churchman of the Cistercian order and chronicled at least two texts which carry valuable information on the political history of his own time. He was the bishop of Freising from 1138.

1040–1127 · Medieval · Benedictines

Ottone Frangipane (1040 – 23 March 1127), also known as Saint Ottone (or Saint Otho), was a Benedictine monk and a hermit. He is patron saint of Ariano Irpino and the diocese of Ariano Irpino-Lacedonia.

600–615 · Medieval

Saint Oudoceus (Latin) or Euddogwy (Welsh) (c.536–c.615 or 625) is generally known as the third Bishop of Llandaff in South Wales. In reality he was probably a 7th-century bishop at Llandeilo Fawr. Wendy Davies puts his episcopal reign between about 650 and 700.

1424–1482 · Medieval · Franciscans

Pacificus da Ceredano (1424 – 4 June 1482) - born Pacificus Ramati - was an Italian Roman Catholic priest and a professed member from the Order of Friars Minor. Pope Benedict XIV approved his "cultus" and beatified him on 7 July 1745.

500–510 · Medieval

Padarn (Latin: Paternus, Padarnus; Welsh: Padarn; Breton: Padern; ? – c. 550 AD) was an early 6th century British Christian abbot-bishop who founded Saint Padarn's Church in Ceredigion, Wales.

550–596 · Medieval

Palladius or more often in French Pallais was a 6th-century bishop of Saintes. According to Gregory of Tours, the family of Palladius was wealthy, and had produced several bishops and teachers throughout the 5th century in Gaul.

650–700 · Medieval

Pamphilus of Sulmona (Italian: Panfilo di Sulmona, died c. AD 700) was bishop of Sulmona and Corfinio (Valva) during the late 7th century. He is revered as a saint by the Catholic Church and the Eastern Orthodox Church.

900 · Medieval

Pandionia (died c. 904; also known as Pandiona or Pandwyna) was an Anglo-Saxon nun and Christian saint, possibly a virgin martyr. Her feast day is 26 August.

1000–1100 · Medieval

Paraskeva of the Balkans, alternatively known as Petka, was an ascetic female saint of the 11th century. She was born in Epivates, near present-day Istanbul, and, according to legends, had visions of the Virgin Mary.

657–737 · Medieval · Benedictines

Saint Pardulphus (Pardulf, Pardoux) (657 – c. 737 AD) was a Frankish saint and Benedictine abbot. The Vita Pardulfi, was written by an anonymous monk around the middle of the eighth century. It is notable for the insight it provides into life in Aquitaine at the time.

1151–1267 · Medieval · Benedictines

Parisius (Italian: Parisio) was a Camaldolese monk and spiritual director. It is believed that Parisius was born in 1160, at either Treviso or Bologna. At the age of twelve, Parisius entered the Camaldolese order.

775–824 · Medieval

Pope Paschal I (Latin: Paschalis I; died 824) was the bishop of Rome and ruler of the Papal States from 25 January 817 to his death in 824. Paschal was a member of an aristocratic Roman family. Before his election to the papacy, he was abbot of St.

792–865 · Medieval · Benedictines

Paschasius Radbertus (785–865) was a Carolingian theologian and the abbot of Corbie, a monastery in Picardy founded in 657 or 660 by the queen regent Bathilde with a founding community of monks from Luxeuil Abbey.

501–606 · Medieval

Paterius (died 606) was a bishop of Brescia. He is known as a compiler, in particular of works of Pope Gregory I, for whom he had worked as a notary.

569 · Medieval

Apollinarius served as Greek Patriarch of Alexandria between 551 and 569. Before his appointment by Justinian I, he was a reader of the monastery of Salama.

550–609 · Medieval

Theodore I, also known as Theodore Scribo, served as Greek Patriarch of Alexandria between 607 and 609. Having been appointed by Phocas, he opposed the Heraclian revolt and was killed in the conflict.

664–685 · Medieval

Patricia of Naples (or Patricia of Constantinople) (Italian: Santa Patrizia) (died ca. 665 AD) is an Italian virgin and saint. Tradition states that she was noble; she may have been related to the Roman Emperor.

496–576 · Medieval

Saint Patroclus of Bourges (c. 496–576) was a Merovingian ascetic, who was a native of the province of Berry, France. A deacon at Bourges, he withdrew to become a hermit. In his childhood Patroclus guarded sheep while his older brother, Antonius, pursued an education.

492–573 · Medieval

Paul Aurelian (known in Breton as Paol Aorelian or Saint Pol de Léon and in Latin as Paulinus Aurelianus) was a 6th-century Welshman who became first bishop of the See of Léon and one of the seven founder saints of Brittany.