Here is a list of 12th-century Christian martyrs:
Saint Thomas Becket (c. 1119–1170) – Archbishop of Canterbury, Thomas Becket was murdered in Canterbury Cathedral by knights loyal to King Henry II, due to his opposition to the king’s interference in church matters.
Saint Olaf II (Olaf Haraldsson) (c. 1030–1070) – Although his martyrdom occurred earlier, his legacy continued to influence the Christian world in the 12th century, and he was regarded as a martyr for the faith.
Saint William of Norwich (c. 1132–1144) – A young boy whose murder was later attributed to a blood libel against the Jewish community. His death became one of the earliest known martyrdoms of a Christian child in medieval England.
Saint Eustace of Luxeuil (d. 1120) – A monk and martyr who was known for his zeal for Christianity, he was killed for defending his faith during the religious conflicts of the time.
Saint Audoenus of Rouen (d. 1118) – Archbishop of Rouen, Audoenus was martyred for his efforts to protect the Christian community during the Norman conquest and the religious turbulence of the period.
Saint Vojtech (Adalbert) of Prague (c. 956–1030) – Although his martyrdom was earlier, his veneration as a martyr continued to grow in the 12th century, and he had a significant influence on Christian missions in Eastern Europe during this time.
The Martyrs of the Albigensian Crusade (1209–1229) – Although this is technically in the 13th century, the roots of this crusade and its efforts against the Cathar heresy began in the 12th century, leading to the deaths of many Christians who resisted the Inquisition.
Robert of Bury: A boy whose death in 1181 was falsely attributed to Jews in Bury St. Edmunds, England, leading to a martyr cult .
Harold (Martyr): A child martyr falsely accused of being killed by Jews in Gloucester in 1168, associated with blood libel accusations .
Charles the Good (Count of Flanders): Count of Flanders, assassinated in 1127 during a conspiracy, later beatified for his pious rule .
Kuksha of Kiev: A monk and missionary martyred in the 12th century for spreading Christianity among the Slavic people .
Anba George: An Egyptian martyr who faced persecution for his faith during the 12th century .
Bashnouna: A Coptic martyr who was killed for her refusal to renounce Christianity in the 12th century
These figures were recognized for their faith and sacrifices during the 12th century, often in the face of political, religious, or social persecution. The 12th century was a period of religious and political conflict, and many figures during this time were persecuted for their Christian faith, though some of their martyrdoms were tied to political and theological conflicts.