Valdemar IV of Schleswig

Valdemar IV Eriksøn (c. 1262–1312) was Duke of Schleswig from 1283, the eldest son of Duke Eric I and Margaret. When his father died in 1272 Valdemar was only about ten, and Eric V of Denmark withheld the duchy for a decade until the Danehof meeting forced his installation in 1283.

The next year he granted city rights to Flensburg. He died in 1312 and was buried in Schleswig Cathedral, succeeded by his heir Eric II.