Ernst von Mansfeld

Peter Ernst von Mansfeld (c. 1580–1626), commonly called Ernst, was an illegitimate son of the Spanish stadtholder Count Peter Ernst von Mansfeld and was raised a Catholic in Luxembourg. From about 1610 he served the Protestant princes and became a leading mercenary general of the early Thirty Years' War.

Sent to aid the Bohemian rebels in 1618, he took Pilsen but was defeated at Sablat in 1619. He held the Upper Palatinate against Tilly in 1621 and beat him at Wiesloch in 1622, then entered Dutch service. Wallenstein routed him at the Dessau Bridge in 1626; retreating through Bosnia, he died near Sarajevo that November.