Hapsburg or Habsburg: In Canton Aargau, the stamm-schloss of the Austrian dynasty, appears in an Eleventh Century document as Habechisburc, "hawk's castle." According to the well-known legend, Radbot, an ancestor of Rudolf of Hapsburg, while hunting in the Aargau lost his favorite hawk, and found it sitting on the ridge of the Wulpelsberg. He was so delighted with the view from the spot that he chose the site for the erection of a castle, which he built about 1020 and called Habichtsburg.

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