Bulgarian Catholic Apostolic Vicariate of Constantinople

On March 28, 1865 he was appointed Apostolic Administrator (pro tempore) of the Bulgarian Byzantine-Catholic Church and its vicariate in Constantinople.

His succession was confirmed on 5 September 1876 by the Holy See and thus he became the new head of Bulgarian Byzantine-Catholic Church and administrator (pro tempore) of its vicariate in Constantinople.

[10] In 1907, priest Michael Mirov was appointed titular Archbishop of Theodosiopolis and took the administration of the Bulgarian Byzantine-Catholic Vicariate in Constantinople.

During those years, Bulgarian Catholic vicariates suffered drastic reduction of their jurisdiction, and after 1918 new arrangements had to be made.

After death of archbishop Michael Mirov in 1923, the vicariate was finally suppressed in 1926 and its remaining (Bulgarian) territory reassigned to establish the Bulgarian Catholic Apostolic Exarchate of Sofia, which remained as the particular church's last and only jurisdiction, absorbing both Constantinople's above daughter vicariates, Thrace and Macedonia.