or Regiomontanus (John), a celebrated astronomer of the 15th century, was born at Koningshoven in Franconia in 1436, and acquired great reputation by publishing an abridgment of Ptolemy's Almagest, which had been begun by Parback. He went to Rome to perfect himself in the Greek tongue, and to see the cardinal Bassoian; but finding some faults in the Latin translations of George de Trebizonde, that translator's son assassinated him in a second journey he made to Rome in 1476, where Pope Sixtus IV. had provided for him the archbishopric of Ratibon, and had sent for him to reform the calendar. Others say that he died of the plague.