King Juan Carlos and Queen Sofia were in Romania in recent days to mourn King Michael, who received a state funeral despite not dying as a reigning monarch.
King Michael ruled during two different periods of Romanian history before being forced to abdicate. He died earlier this month in Switzerland.
Both King Juan Carlos and Queen Sofia shared family and friendship ties with King Michael.
Spain’s royal are continuing their intense agenda ahead of the Christmas holidays.
In recent days King Felipe swore in Julián Sánchez Melgar as new state prosecutor.
Queen Letizia left on a trip to Senegal, where she will see Spanish foreign aid at work.
King Juan Carlos, who has been on the agenda more than usual in recent weeks, attended the opening of an exhibit on Spanish flight history.
Queen Sofia accepted a human rights award to the Queen Sofia Foundation at the University of Seville.
Several other events are already on the schedule, include a visit by King Felipe to the Canary Islands.
King Felipe today honored former Congress of Deputies Presiddent Manuel Marín González, who died at 68.
Don Felipe met with family members and parliamentarians at the Congress Palace in Madrid.
Marín González was Congress president from 2004 to 2008 under the Socialist Party. He was also a diplomat and helped Spain become a member of the European Union.
King Juan Carlos and Queen Sofia have been in the public eye several times in recent weeks, sometimes together.
Their Majesties have kept a lower profile since handing the reins to King Felipe and Queen Letizia, but stay close to favorite projects.
The elder King and Queen were together late last month for an awards ceremony at the Royal Academy of Sciences.
Don Juan Carlos was present by himself also recently for handing out the 11th Fondena Prize for nature protection.
Queen Sofia was by herself early last month at the Royal Palace in Madrid to hand out a prize in her name for Ibero-American poetry.
Both King Juan Carlos and Queen Sofia were at the headquarters of the Royal Academy of Fine Arts to celebrate the Royal Theater.
Today Queen Sofia attended a meeting of the leadership of the Íñigo Álvarez de Toledo renal foundation.