With the territorial changes that the Kazan diocese experienced the title of the ruling [[hierarch]] also changed. Initially, the [[bishop]] held the title ''…of Kazan and Sviyazhsk''. With the addition of the territories of Astrakhan, Metr. Hermogen used the title ''…of Kazan and Astrakhan'', while [[Metropolitan]] Ioasaf was the ''Bishop of Kazan and Bolgar''. During the period from 1795 to 1832, the bishops of Kazan used the title ''…of Kazan and Simbirsk''. During the Soviet times the bishops used the original title ''……of Kazan and Sviyazhsk'' until 1950. Then, in succession, the titles changed from ''…of Kazan and Chistopol'' (1944 to 1958), to ''…of Kazan and Mari'' (1958 to 1993), and finally to ''…of Kazan and Tatarstan'' (1993 to the present).
In addition to the ruling hierarchs, a number of vicariates were established after 1799. The first established was the [[vicar]] of Sviyazhsk that was abolished in 1822. This position was followed by adding a vicar of Cheboksary in 1853 who was also the hegumen of the Kizichesky Monastery, a vicar of Chistopol in 1899 who was the rector of the [[Kazan Theological Academy]], and a vicar of Mamadysh in 1907 who was also hegumen of the Savior-Transfiguration Monastery. All the vicars resided in Kazan.