In addition to the evidence of the "Chronicle" that Æthelberht was accorded the title of "bretwalda", there is evidence of his domination in several of the southern kingdoms of the Heptarchy. In Essex, Æthelberht appears to have been in a position to exercise authority shortly after 604, when his intervention helped in the conversion of King Sæberht of Essex, his nephew, to Christianity. It was Æthelberht, and not Sæberht, who built and endowed St. Pauls in London, where St Paul's Cathedral now stands. Further evidence is provided by Bede, who explicitly describes Æthelberht as Sæberht's overlord.