A royal court official says 94-year-old Princess Lilian, the oldest member of Sweden's royal family, has Alzheimer's disease.
Her condition was revealed Thursday by Court Marshal Elisabeth Palmstierna. It wasn't previously known to the public.
The Welsh-born Lilian has cut down on her royal duties in recent years for health reasons. Palmstierna says she won't attend Crown Princess Victoria's wedding to Daniel Westling on June 19.
"Lilian is very tired and will not be coming to the wedding. She is old and frail," Palmstierna told the Aftonbladet daily.
In 1976 Lilian married Sweden's Prince Bertil, the uncle of the current king, Carl XVI Gustaf. Bertil died in 1997.
Victoria is the king's oldest child and next in line to the throne. The monarch in Sweden is a ceremonial figure.