Aside from Guthrum’s defeat, it was his baptism as a part of the Treaty that would seal Alfred’s fate as Alfred the Great. Guthrum was baptized and accepted as Alfred’s adoptive son. He was kicked out of Wessex and given the lands referred-to as the “Danelaw”. As much as this makes Alfred great, one tends to wonder why Guthrum took the extra step in accepting Alfred as his father? Interesting to say the least.
Scene from The Last Kingdom, wherein Guthrum is Baptized (also some behind the scenes footage):
Alfred The Great 