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On his deathbed, Peuerbach made Regiomontanus promise to complete the work, which he did, although the new translation of Ptolemy was not carried out.

Regiomontanus was one of the first to benefit from the supply of ancient Greek texts that reached Italy after the fall of Constantinople.

Regiomontanus had a very picturesque career, finally taking up his residence in Nuremberg, where a wealthy citizen named Walther became his patron, pupil, and collaborator.

This Johannus Regiomontanus, a Franconian, has proved, with a skill hitherto equalled only by that of those who proved the ninth sphere, which travels from west to east.

The invitation was accepted on condition that his pupil Regiomontanus should go with him.