Who are the ancestry of King Charles II of Spain?

King Charles II of Spain was a member of the Habsburg dynasty. He was the son of King Philip IV of Spain and Mariana of Austria, who was also his aunt, as they were both descendants of the Habsburg family. This close intermarriage among royal families was common in Europe at the time, aiming to preserve power and alliances. Charles II's lineage was marked by significant inbreeding, which contributed to his physical and mental health issues.