Casimir (or Kasimir) of Brandenburg-Bayreuth (27 December 1481 – 21 September 1527) was Margrave of Bayreuth or Margrave of Brandenburg-Kulmbach from 1515 to 1527. Life Family background Casimir was born in Ansbach, as the son of Frederick I, Margrave of Brandenburg-Ansbach and his wife Princess Sofia Jagiellon, a daughter of King Casimir IV Jagiellon of Poland. From 1498, Casimir's father Frederick granted him the position of stadtholder of the margraviate during his extensive travels. He ruled under the guidance of experienced advisors. In 1515, Casimir and his younger brother George deposed their father, who had greatly burdened the finances of the margraviate with his lavish lifestyle. Casimir then locked up his father at his residence at Plassenburg Castle, in a tower room from which his father could not escape for 12 years. He took up the rule of the Margraviate of Brandenburg-Kulmbach while his brother George ruled the Margraviate of Brandenburg-Ansbach. However, since his younger brother often stayed at the Hungarian royal court, Casimir ruled Brandenburg-Ansbach on his behalf. The overthrow of his father outraged Casimir's other brothers and led to far-reaching political countermeasures. When Elector Joachim I of Brandenburg visited Kulmbach during his journey to Augsburg, and wanted to plead for the release of Casimir's father, he was denied access to Plassenburg Castle. The Elector's brother, Albert of Brandenburg, then turned against him and sided with Emperor Charles V, and was rewarded with a cardinal's hat. The dispute was resolved when an agreement was reached in 1522, in which the demands of the other brothers of Casimir were met. Margrave Casimir died at Buda in 1527. At that point, his brother George took up the regency of Brandenburg-Kulmbach until Casimir's eldest son, Albert II Alcibiades, came of age in 1541. Involvement in the Swabian League Casimir was a vassal of Emperor Maximilian I and fought in 1499 alongside his father and Margrave Christopher I of Baden as the commander of the Swabian League against the Old Swiss Confederacy and led the negotiations that resulted in the Peace of Basel. In subsequent years, he continued to be active as a military leader and diplomat in Habsburg service. He participated in 1506 in Schwäbisch Hall against the Swabian League and in 1509 in the Diet at Worms. In 1513, he was imperial commissioner at the assembly of the Swabian League at Nördlingen dealing with a breach of the peace by Götz