Gregory, however, also says that he thinks that Ingoberg was seventy years old in 589; and this would make her about forty when she married Charibert. This is possible, but seems unlikely, especially as Charibert seems to have had a preference for younger women, again according to Gregory's account. This would imply an earlier birth date for Bertha. On the other hand, Gregory refers to Æthelberht at the time of his marriage to Bertha simply as "a man of Kent", and in the 589 passage concerning Ingoberg's death, which was written in about 590 or 591, he refers to Æthelberht as "the son of the king of Kent". If this does not simply reflect Gregory's ignorance of Kentish affairs, which seems unlikely given the close ties between Kent and the Franks, then some assert that Æthelberht's reign cannot have begun before 589.