Lomnický showed his gratitude by writing on the death of Peter of Rosenberg perhaps his one touching and heartfelt poem. That Peter was, like his brother, interested in alchemy, hardly requires mention, for almost all the great Bohemian nobles then followed the example of Rudolph, their sovereign, who delighted in the study of alchemy. Peter's interest in music was also very great. Even before inheriting Wittingau from his brother William, he had established a small orchestra at Běychin, and he afterwards devoted much time and expense to the improvement and aggrandisement of the magnificent orchestra which Lord William had founded at Wittingau. Březan, in his biographies of both brothers, gives an interesting account of the cultivation of music in Bohemia in the sixteenth and the beginning of the seventeenth century. Lord Peter also undoubtedly showed a considerable amount of interest in other arts. In Březan's biography, written in chronological order, we read under "December 19, 1598.--The Lord of Hradec sent our sovereign lord (Lord Peter) eighteen pretty painted figures, very poetical, and representing Venus." In Bohemian politics Peter of Rosenberg played a very important part, and his change of creed appeared as an event of the greatest importance on the ever-varying stage of Bohemian political life. Peter of Rosenberg was on terms of intimacy with Christian of Anhalt, perhaps the greatest statesman of the seventeenth century. He acted as Anhalt's representative in Bohemia, and was no doubt initiated into his far-reaching plans. Anhalt, as recent research has sufficiently proved, intended to use the dissensions between Rudolph and his brother Matthew for the purpose of totally destroying the power of the House of Habsburg. On these and similar subjects of the greatest interest Březan has little or no information to give, and his biography, as already stated, is disappointing. The book, written in chronological order, contains accounts of Lord Peter's travels, but here, too, a mere outline of the occurrences is given. When mentioning Peter's journey to England, Březan merely tells us (under February 1563) that "after Lord Peter had been received in England with Christian kindness by her royal majesty Queen Elizabeth, and had then been kindly and graciously dismissed, her majesty was graciously pleased to grant him a royal decree addressed to all her officials and to those of all the towns." Březan then gives the full wording of this passport, if we may thus call it, in which Lord Peter is described as "one of the chamberlains of our good brother the King of the Romans."