By the ninth century, Aethelberht is listed in the ASC as 'bretwalda,' or 'ruler of Britain.'.    From Wordnik.com.  [Archive 2006-10-01] Reference

So when Augustine arrived he was welcomed by Aethelberht, whose wife Bertha, a Frankish princess, was already a.    From Wordnik.com.  [Bell's Cathedrals: Chichester (1901) A Short History & Description Of Its Fabric With An Account Of The Diocese And See] Reference

Most sources credit the seeds of the Papacy as we know it to Gregory I Bishop of Rome from 590-604, and his sending Augustine of Canterbury to convert Aethelberht of Kent in 597.    From Wordnik.com.  [Archive 2006-10-01] Reference

Aethelberht, as Bretwalda, allowed his wider territory to be mapped out into dioceses, and exerted himself in Augustine's behalf to bring about a meeting with the Celtic bishops of Southern Britain.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 2: Assizes-Browne] Reference

Aethelberht became King of Kent in 559 or 560, and in less than twenty years he succeeded in establishing an overlordship that extended from the boulders of the country of the West Saxons eastward to the sea and as far north as the Humber and the Trent.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 2: Assizes-Browne] Reference

I, xxv) and that they waited there in obedience to King Aethelberht orders until arrangements could be made for a formal interview.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 2: Assizes-Browne] Reference