Teofilius Matulionis was a Lithuanian Roman Catholic prelate who served as the Bishop of Kaišiadorys. Born in 1873, he spent much of his ministry facing persecution from Soviet authorities, which resulted in numerous periods of imprisonment and exile. Despite being consecrated as a bishop in secret, he continued his pastoral duties under extreme hardship, including performing religious rites in prison. He died in 1962, with later examinations suggesting he was poisoned by officials. He is recognized as a blessed in the Catholic Church for his steadfastness and martyrdom.