Normally it is given by the Emperor when a son of an Imperial family gets married and becomes independent, but Imperial Prince Yoshihito, the second son of the Mikasanomiya family established a Miyake unmarried and was given the title of Katsuranomiya.
通常は皇族男子が婚姻し独立する際に天皇から賜るが、三笠宮家の次男である宜仁親王は独身のまま宮家を創設し、桂宮の称号を賜った。