Tycho Brahe personalities. When Tycho and Vedel returned from Leipzig in 1565, Denmark was at war with Sweden, and as vice-admiral of the Danish fleet Jørgen Brahe had become a national hero for having participated in the sinking of the Swedish warship "Mars" during the First battle of Öland (1564). Shortly after Tycho's arrival in Denmark, Jørgen Brahe was defeated in the Action of 4 June 1565, and shortly afterwards died of a fever. Stories have it that he contracted pneumonia after a night of drinking with the Danish King Frederick II when the king fell into the water in a Copenhagen
Tycho Brahe in 1580, taught Count Wilhelm of Kassel and his astronomer Christoph Rothmann to build copies of Brahe's instruments without permission from Brahe. In turn, Craig, who had studied with Wittich, accused Brahe of minimizing Wittich's role in developing some of the trigonometric methods used by Brahe. In his dealings with these disputes, Tycho Brahe made sure to leverage his support in the scientific community, by publishing and disseminating his own answers and arguments. When Frederick died in 1588, his son and heir Christian IV was only 11 years old. A regency council was appointed to rule for the young prince-elect