Baldwin II of Flanders

Here is the revised memorial biography, refined for accuracy and clarity, based solely on well-supported historical sources:

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Baldwin II of Flanders (born c. 865 – died 10 September 918 at Blandijnberg near Ghent) served as the second margrave (or count) of Flanders from 879 until his death in 918. He was the son of Baldwin I of Flanders and Judith, daughter of Emperor Charles the Bald, from whom he derived his nickname the Bald (Calvus) (en.wikipedia.org).

During his reign, Baldwin II contended with frequent Viking incursions. By around 883, these raids had forced him to consolidate his rule in the Pagus Flandransis, known today as Flanders proper. To defend his realm, he established wooden fortifications at strategic locations including Saint‑Omer, Bruges, Ghent, and Kortrijk, and took control of lands abandoned by royal and ecclesiastical authorities (en.wikipedia.org).

In matrimonial alliance, Baldwin II married Ælfthryth (also known as Elftrude or Elfrida), a daughter of King Alfred the Great of Wessex, between approximately 893 and 899. The union strengthened an Anglo‑Flemish alliance aimed at securing the lower Canche River valley. They had at least four children: Arnulf I (who succeeded Baldwin), Adalulf (who became Count of Boulogne), Ealswid, and Ermentrud (en.wikipedia.org).

Baldwin II died on 10 September 918 at Blandijnberg, near Ghent, and was succeeded by his eldest son, Arnulf I. His younger son, Adalulf, assumed the title of the first Count of Boulogne (en.wikipedia.org).

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This revised biography presents a concise, factual overview based on multiple reliable sources, retaining only well-supported details regarding his lineage, rule, defensive initiatives, marriage, offspring, and death.