Saint Boniface of Tarsus (Greek: Βονιφάτιος) was, according to legend, executed for being a Christian in the year 307 at Tarsus, where he had gone from Rome in order to bring back to his mistress Aglaida (also written Aglaia) relics of the martyrs.

[3] His own body constituted the relics that were brought back to Aglaida, who in turn became a Christian.

The Eastern Orthodox Church celebrates both of them on 19 December as the "Martyr Boniface at Tarsus in Cilicia and Righteous Aglaida of Rome".

[2] In the 12th century, the name of Boniface (without Aglaida) was included on 14 May in the General Roman Calendar with the lowest rank of feast ("simple").

[5] Because of the date of his feast, Boniface of Tarsus was one of three who, because a cold spell was believed to be common on 12–14 May, were called the Ice Saints in Switzerland, Poland, Bohemia and eastern Germany, a tradition known also to Martin Luther.