Mar Shimun VIII Yohannan Sulaqa (or John Soulaqa, Sulaka or Sulacha, circa 1510–1555) was the first Patriarch of the Chaldean Catholic Church, from 1553 to 1555. Yohannan Sulaqa was elected by those who opposed the hereditary patriarchal succession and he took an unprecedented step in the Church of the East: he traveled to Rome, accepted the Catholic creed and was consecrated as Patriarch in 1553.