| Mar Shimun XII Yoalaha | |
|---|---|
| Patriarch of the Chaldeans | |
| Church | Chaldean Catholic Church |
| See | Patriarchial See of Babylon of the Chaldeans Shimun line of the Chaldeans |
| Enthroned | 1656 |
| Reign ended | 1662 |
| Predecessor | Shimun XI Eshuyow |
| Successor | Shimun XIII Dinkha |
| Personal details | |
| Died | 1662 |
| Residence | Salmas |
Mar Shimun XII Yoalaha was the seventh Patriarch of the Chaldean Catholic Church, from 1656 to 1662.
He succeeded Patriarch Shimun XI Eshuyow, the seat of the patriarchate of Babylon of the Chaldean Catholic church being in Salmas during his reign.
Mar Shimun XII Yoalaha like his predecessors Shimun X Eliyah and Shimun XI Eshuyow was not formally recognized by Rome after the hereditary Shimun line of Patriarchs was reintroduced by Patriarch Shimun IX Dinkha in the Chaldean church. Hereditary succession is an unacceptable practice in Roman Catholic Church.
His successor in 1662 was Shimun XIII Dinkha the last of the Shimun line in the Chaldean Church.
| Preceded by Shimun XI Eshuyow |
Patriarch of Babylon 1656–1662 |
Succeeded by Shimun XIII Dinkha |