Russian Blonde Girl On The Roof Of The House With Saint Basil's Cathedral In Background

Chronists clearly identified the new building as Trinity Church, after its easternmost sanctuary; the status of "sobor" (cathedral) has not been bestowed on it yet:
“On the Trinity on the Moat in Moscow.
In the same year, through the will of tsar and lord and grand prince Ivan began making the pledged church, as he promised for the capture of Kazan: Trinity and Intercession and seven sanctuaries, also called "on the moat". And the builder was Barma with company.”