History
- 1578: Established as Oblates of Saints Ambrose and Charles (English) / Oblaten der heiligen Ambrosius und Karl (Deutsch) / Oblati dei Santi Ambrogio e Carlo (Italiano) / Congregatio Oblatorum Sanctorum Ambrosii et Caroli (latine) / O.Ss.C.A. (from Metropolitan Archdiocese of Milano)
- 1810: Suppressed (merged into Metropolitan Archdiocese of Milano)
- 1854: Restored as Oblates of Saints Ambrose and Charles (English) / Oblaten der heiligen Ambrosius und Karl (Deutsch) / Oblati dei Santi Ambrogio e Carlo (Italiano) / Congregatio Oblatorum Sanctorum Ambrosii et Caroli (latine) / O.Ss.C.A. (from Metropolitan Archdiocese of Milano)