When researchers in Barcelona recently opened centuries-old royal tombs, they uncovered a startling mystery: Several contained the wrong people. The exhumations took place at the Royal Monastery of Santa Maria de Pedralbes in Barcelona, Spain, a nearly 700-year-old Gothic monastery founded by Queen Elisenda of Montcada. The wife of King James II of Aragon, Elisenda, founded the monastery in 1326 — and to mark its 700th anniversary, researchers wrapped up a multidisciplinary investigation into its medieval tombs. They found that many of the remains did not belong to the people assigned to the tombs. The sheer number of skeletons found was surprising, said Enric Puga, communications officer for the Royal Monastery of Santa Maria de Pedralbes.