In contrast to his fellow-countryman Boniface, Willibrord did not leave any correspondence or other writings. As a matter of fact, the only thing known to us is a small private note, consisting of a few lines. This note was written when he was seventy years old and is part of the liturgical calendar which he carried with him on his missionary travels. Here Willibrord, speaking about himself in the third person, mentions two events from his eventful life: first, that he came across the sea to the Frankish Kingdom in 690, secondly, that he was consecrated bishop by Pope Sergius in Rome five years later. These are the only things he says about himself.