While no proposed date for the composition of Acts is universally accepted, the most common scholarly position is to date Luke–Acts to 80-90 AD, on the grounds that it uses Mark as a source, looks back on the destruction of Jerusalem, and does not show any awareness of the letters of Paul (which began circulating late in the first century).[13][14][15] The earliest possible date for the composition of Acts is set by the events with which it ends, Paul's imprisonment in Rome c.63 AD, but such an early dating is a minority position.[9][13][14] The last possible date would be set by its first definite citation by another author, but there is no unanimity on this; some scholars find echoes of Acts in a work from c. 95 AD called I Clement, while others see no indisputable citation until the middle of the 2nd century.[13] A minority of scholars, necessarily in the latter camp, conclude that Acts dates to the 2nd century, believing that it shows awareness of the letters of Paul, the works of Josephus, or the writings of Marcion.[13][16]