Ivan Asen IV of Bulgaria

Ivan Asen IV (c. 1326 – 1349) was a Bulgarian prince, the third son of Tsar Ivan Alexander and Theodora of Wallachia. In 1349 he led Bulgarian forces against an Ottoman army under Süleyman in a fierce battle near Sofia.

Both sides suffered heavy losses and Ivan Asen was killed in the fighting; the Bulgarians appear to have beaten off the raid, as the next Ottoman incursion came only in 1355. He had married a Wallachian princess of the Basarab dynasty and left two daughters.