1. Saint John I, pope and martyr, who, sent by the Arian King Theodoric to Emperor Justin of Constantinople, was the first Roman Pontiff to celebrate the paschal sacrifice in that Church. On his return from Constantinople, he was received unworthily by the same Theodoric and thrown into prison, dying in Ravenna (Italy) as a victim for Christ the Lord. († 526)

2.  In Salona (now Solin, Croatia), Saint Felix, martyr during the persecution of Emperor Diocletian. († 299)

3.  In Egypt, Saint Dioscorus, martyr, son of a lector, who, after many and diverse torments, was beheaded and thus consummated his martyrdom. († c. 303)

4. In Alexandria (Egypt), Saints Potamon, Ortasius, Serapion, presbyters, and their companion martyrs. († 4th cent.)

5. In Ancyra in Galatia (now Ankara, Türkiye), the holy martyrs Theodotus and his aunt Thecusa, along with Alexandra, Claudia, Phaina, Euphrasia, Matrona and Julitta, virgins; the latter were first forced into prostitution by the governor and then thrown into a swamp with rocks tied around their necks. († c. 303)

6. * In the territory of Aargau (Switzerland), Blessed Burkard, parish priest of Beinwil, who guided the people entrusted to his care with great pastoral solicitude. († 12th century)

7. In Uppsala (Sweden), Saint Erik IX, king and martyr, who during his reign wisely led his people, defended the rights of women, and sent Bishop Saint Henrik to Finland to propagate the Christian faith; but finally, attacked while attending the celebration of Mass, he was stabbed to death by his enemies. († 1161)

8. * In Toulouse (France), Blessed Guillaume, priest of the Order of Saint Augustine. († 1369)

9. In Rome (Italy), Saint Felice Porri from Cantalice, a religious of the Order of Friars Minor Capuchin, endowed with admirable austerity and simplicity, who exercised for forty years the office of almsgiver and always radiated peace and charity around him. († 1587)

10. In Gongju (South Korea), Saint Thomas Son Cha-sŏn,^[1] layperson and martyr, who, after being subjected to cruel tortures, was hanged for his faith in Christ. († 1866)

11. * In Trier (Germany), Blessed Blandine of the Sacred Heart (Maria Magdalena Merten), professed religious of the Order of Saint Ursula, who combined the contemplative life with a commitment to the human and Christian formation of girls and adolescents. († 1918)

12. * At the Dachau concentration camp, in Oberbayern (Germany), Blessed Stanisław Kubista, priest of the Society of the Divine Word and martyr, who, during wartime, gave up his spirit for Christ while locked in a gas chamber. († 1942)

13. * At the Hartheim killing centre, near Linz (Austria), Blessed Marcin Oprządek, priest of the Order of Friars Minor and martyr, a native of Poland, who reached the heavenly kingdom at the same time and in the same way as the previous martyr. († 1942)

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[1] Originally included among the Korean martyrs celebrated on 30 March.