of Expiate
Source: Webster's dictionaryCanduci, pg. 294 He died of disease, at Harzburg castle on May 19, 1218, requesting that he be mortally expiated in atonement of his sins. Source: Internet
Realising the appalling nature of his crimes, Chrysostom made a vow that he would never rise from the ground until his sins were expiated, and for years he lived like a beast, crawling on all fours and feeding on wild grasses and roots. Source: Internet