King Juan Carlos and Queen Sofia, long known to be a distant couple, have taken part in a series of events together.
Last week, Their Majesties attended a ceremony for the publication of Bulgarian King Simeon’s memoirs.
The Bulgarian royals in exile have set roots in Spain and created close ties with Spain’s monarchs.
Separately, King Juan Carlos and Queen Sofia recently visited an art exhibit at the Royal Palace in Madrid.
King Juan Carlos and Queen Sofia were also together during a visit to Spain by former Queen Beatrix of the Netherlands.