It was, however, during his rule that the Counts of Celje strengthened their positions by developing family and political connections stretching far beyond their native region, thus rapidly emancipating themselves from the Habsburg tutelage.

In 1387, he was enfeoffed with the castle and estate of Dravograd by the Habsburg duke Albert III, further expanding the Celje's possessions along the Drava River in southern Carinthia.

[4] However, Elizabeth died young, and William eventually married the daughter of the late Polish king Casimir the Great.

William died in 1392 without sons, and was succeeded by his cousin Hermann II, who became the sole ruler of the House of Celje.

In order to neutralize any possible future threat from her part (or by a husband or son of hers), Louis, who was now her caretaker, decided to betroth her to a loyal, faraway and relatively unimportant ally.

The House of Celje could only benefit from marrying a princess of royal blood, but they were in no position to challenge Louis's kingship.