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==Legacy==
Rollo's dynasty survived through a combination of ruthless military action and infighting among the 10th-century Frankish aristocracy, which left them severely weakened and unable to resist the Rouen Vikings' growing determination to stay put.{{sfn|Van Houts|2000|p=15}} After Rollo's death, his direct male descendants continued to rule Normandy until [[Stephen of Blois]] became King of England and Duke of Normandy in 1135.<ref>Huscroft, Richard (2005) "Ruling England, 1042–1217", ''The English Historical Review'', p. 69</ref> The duchy was later absorbed into what became the [[Angevin Empire]] following its conquest by [[Geoffrey Plantagenet, Count of Anjou|Geoffrey of Anjou]], who in 1128 had married [[Matilda of England]], herself a descendant of Rollo.<ref name="chh">Haskins, Charles H. 1912. "Normandy Under Geoffrey Plantagenet", ''The English Historical Review'', volume 27 (July): 417–444.</ref>

Rollo left a legacy as the founder of Normandy, and his leadership and integration of Viking settlers into the region transformed it into a stable political entity.<ref>Davy, Gilduin. “The Laws of Rollo as a Primitive Constitution for Normandy: Writing and Rewriting Legal History in France during the Seventeenth and Eighteenth Centuries.” The English Historical Review, vol. 138, no. 594-595, 30 December 2023, pp. 1255–1276, https://doi.org/10.1093/ehr/cead178.</ref> 
His lineage played a key role in shaping medieval Europe, as it was [[William the Conqueror]], another descendant of Rollo, who famously led the [[Norman Conquest|Norman Conquest of England]] in 1066. Rollo's baptism also marked a significant point in the assimilation of Viking settlers into Frankish society.