Albert's daughter Agnes, Queen of Hungary, "a woman unacquainted with the milder feelings of piety, but addicted to a certain sort of devotional habits and practices by no means inconsistent with implacable vindictiveness," fearfully avenged his murder. This woman appears to have been seized with a perfectly demoniacal mania for blood and revenge. Aided by those in authority, who feared lest a widespread conspiracy had been formed, she seized, on the slightest suspicion, hundreds of innocent victims and put them to death with all the ferocity of a famished beast. Members of nearly a hundred noble families, and at least a thousand persons of lower rank, of every age and of both sexes, fell beneath her savage vengeance. She is said to have further whetted her appetite for horrors by wading, at Fahrwangen, in the blood of sixty-three innocent knights, exclaiming the while, "This day we bathe in May-dew." But at last, after several months, even the implacable bloodthirstiness of the Hungarian Queen was satisfied, and the massacre ceased. Over the spot where Albert met his death Agnes built a monastery; she named it Koenigsfelden and enriched it with the spoils of her victims. Here she took up her abode for the remainder of her life, and for nearly fifty years practised the most rigid asceticism, and here, by the side of her parents, she was eventually buried. Koenigsfelden stood on the road from Basel to Baden and Zurich, and within sight of the castle of Hapsburg, the cradle of the house of Austria. Strenuous efforts were made by Albert's widow to obtain the succession to the imperial throne for her son, Frederick, Duke of Austria, but the choice of the prince-electors, headed by the Archbishop of Mainz, fell on Count Henry of Luxemburg, a liberal-minded and generous noble, who was accordingly crowned, under the title of Henry VII. During the short reign of this monarch he proved himself a wise and generous friend to the Swiss, whose privileges he confirmed. He made no effort to reimpose local governors on the people of the Waldstaette, but, on the contrary, confirmed the charters of Schwyz and Uri, granted one to Unterwalden, and acknowledged jurisdiction. After Henry's death, in 1313, civil war once more divided the empire through the rival contentions of Ludwig (Louis) of Bavaria and Albert's son, Frederick of Austria. In this contest the powerful monastery of Einsiedeln sided with the Austrian candidate, and through its influence induced the Bishop of Constance to place the large portion of Switzerland supporting the Bavarian cause under a sentence of excommunication.