John Casimir, Count Palatine of Kleeburg
John Casimir, Count Palatine of Zweibrücken-Kleeburg was the son of John I, Count Palatine of Zweibrücken and his wife, Duchess Magdalene of Jülich-Cleves-Berg and was the founder of a branch of Wittelsbach Counts Palatine often called the Swedish line, because it gave rise to three subsequent kings of Sweden, but more commonly known as the Kleeburg line.
In 1591 his father stipulated that, as the youngest son, John Casimir would receive as appanage the countship of Neukastell in the Palatinate. Upon their father's death in 1611, however, the eldest son, John II, Count Palatine of Zweibrucken, instead signed a compromise with John Casimir whereby the latter received only the castle at Neukastell coupled with an annuity of 3000 florins from the countship's revenues.
On 11 June 1615, Casimir married his second cousin Catherine of Sweden, and their son eventually became King Charles X of Sweden.Family
Five of his children with Catherine survived infancy:
