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Rh shorter time assisted Tycho Brahe, we know little but the names. A certain Hans Coll, or Johannes Aurifaber, who had charge of the workshop, must have been with him a long time, as he is mentioned as observing in 1585, and he died at Hveen in 1591. Many details as to the life at Hveen were communicated to Gassendi by Willem Janszoon Blaev, the celebrated printer at Amsterdam, who in his youth (he was born at Alkmaar in 1571) had spent a few years at Hveen, and to whom we also owe the large map of the island in his son's Grand Atlas.

Two other inmates of Tycho's house may also be mentioned here. One was a maid of the name of Live (or Liuva) Lauridsdatter, who afterwards lived with Tycho's sister, Sophia, and later was a sort of quack-doctor at Copenhagen, where she also practised astrology, &c. She died unmarried in 1693, when she is said to have reached the ripe age of 124. The other was his fool or jester,