The Spanish royal family attended a Mass at the Royal Chapel in Madrid to commemorate the centenary of the birth of the Count of Barcelona, who was the father of King Juan Carlos. Also in attendance were the Spanish prime minister and senior government officials. The Count of Barcelona (1913-1993) was the third son of King Alfonso XIII of Spain and Queen Victoria Eugenie (who was one of the subjects of my first book, “Born to Rule”). After his two elder brothers renounced their claims to the throne of Spain, the Count of Barcelona became the designated heir. In 1975, the Count of Barcelona’s son, Juan Carlos, became king of Spain after the death of General Francisco Franco. Photos by Getty Images.