Father Sergius (1978)

Prince Stepan Kasatsky is an officer, an ardent, proud young man, and a big fan of the tsar. Kasatsky is going to marry, but at the last moment he learns from the bride that she was the mistress of the emperor. The prince is deeply disappointed in social life, he takes a monastic vow and leaves the capital. Faith in God was to save the soul, but passions and worldly temptations don't leave Kasatsky.