Mar Shimun XVIII Rubil (also known as Simon XVIII Rouel or Rowil) served as the Catholicos-Patriarch of what would come to be called the Assyrian Church of the East from 1861 until 1903, succeeding his uncle Shimun XVII Abraham. He led the church from Qodshanis, in southeastern Turkey. In 1869, he received an invitation from the Vatican to attend the First Vatican Council as an observer, but he did not accept the invitation, and he also rejected other initiatives for the union with the Catholic Church.
The Catholicos-Patriarch died on March 16, 1903, and was succeeded by Shimun XIX Benyamin.
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External links Official site of the Assyrian Church of the East