The defeat raised serious alert not only in Tarnovo, but also in Constantinople, forcing John Kantakouzenos to abdicate and removing one of the main facilitators of the Ottoman invasion. Faced with threat, Bulgaria and Byzantium made an attempt for rapprochement. In 1355 a daughter of the Bulgarian Emperor, Keratsa, married Andronikos, the infant son of the new Byzantine Emperor John V Palaiologos. Unfortunately, the new relations between the houses of Tarnovo and Constantinople did not live up to the expectations of mounting a more significant response to the invading Ottomans.