Agnes of Ostfriesland (1584-1616) (1584–1616) Parents Walburgis, Countess of Rietberg Enno III, Count of East Frisia Children Prince Hartmann III of Liechtenstein Siblings Anna Maria of Ostfriesland Sabina Catherine of East Frisia Rudolf Christian, Count of East Frisia Ulrich II, Count of East Frisia Christina Sophia of East-Frisia Partners Gundakar, Prince of Liechtenstein