As outlined by Dudo, Rollo struck up a friendship in England having a king identified as Alstem. This has puzzled many historians, but just lately the puzzle has been settled by recognition this refers to Guthrum, the Danish chief whom Alfred the Great baptised Along with the baptismal identify Athelstan, https://messiahmsxcg.wikififfi.com/681204/5_easy_facts_about_shed_described