In accordance with Dudo, Rollo struck up a friendship in England with a king termed Alstem. This has puzzled a lot of historians, but lately the puzzle has been resolved by recognition that this refers to Guthrum, the Danish chief whom Alfred The good baptised Using the baptismal title Athelstan, https://storage10864.wikissl.com/680916/the_2_minute_rule_for_5x5_shed