After his appointment to the archbishopric in 735, he attended to ecclesiastical matters, including holding church councils.
Nothhelm was a contemporary of Boniface and Bede, whom he supplied with correspondence from the papal library following a trip to Rome.
[4] He also researched the history of Kent and the surrounding area for Bede, supplying the information through the abbot of St Augustine's Abbey in Canterbury.
[9] He held a synod in 736 or 737, which drew nine bishops;[8] the meeting adjudicated a dispute over the ownership of a monastery located at Withington.
A verse eulogy for Nothhelm, of uncertain date, survives in a 16th-century manuscript now at the Lambeth Palace library.