Later in 1204, Constantinople was sacked by the Catholic armies of the Fourth Crusade, whereas two decades previously the Massacre of the Latins (i.e. Catholics) had occurred in Constantinople in 1182. Thus, by the 12th–13th centuries, the two sides had become openly hostile, each considering that the other no longer belonged to the Church that was orthodox and catholic. Over time, it became customary to refer to the Eastern side as the Orthodox Church and the Western as the Catholic Church, without either side thereby renouncing its claim to be the truly orthodox or the truly catholic Church.