11.   She performs royal duties alongside those of the reigning monarch and in her own right in a constitutionally recognized role.

12.   The frail mother of Queen Beatrix, the reigning monarch, withdrew from public life in February saying the strains were too much for her.

13.   The king and Queen Sofia arrived Saturday for a four-day visit, the first by a reigning Spanish monarch to the Philippines.

14.   The queen is only the second reigning monarch in British history to achieve a golden wedding anniversary.

15.   The royal couple arrived Saturday on a four-day visit, the first by a reigning Spanish monarch to the Philippines.

16.   The title, now belonging to Prince Charles, continues to be held by the eldest son of the reigning monarch.

17.   Under current law, the reigning monarch is head of the Church of England and Catholics are not allowed to succeed to the throne or to marry a monarch.

18.   While city status offers no extra royal or government privileges, it is considered a rare honor, conferred only by the personal command of the reigning monarch.

19.   At Windsor Castle, the Royal Standard flew at full mast as royal tradition dictates -- it is only lowered when a reigning monarch dies.

20.   The reigning monarch of Britain automatically becomes head of the Church of England.