Willbirg (Wilbirg, Wilpirg) of Helfenstein Countess of Hardegg (Hardeck), Heiress of the County of Hardegg, died 1314 (1300–1314) Parents Ulrich II, Count of Helfenstein Willibirg von Dillingen Children Siblings Agnes of Helfenstein Ulrich III, Count of Helfenstein Partners Otto of Plain and Hardegg Henry of Dewin-Hardegg Berthold von Rabenswalde von Hardegg