This is the joint tomb of João I of Portugal (d. 1433) and his queen, Philippa of Lancaster (d. 1415).
Philippa of Lancaster (Portuguese: Filipa de Lencastre; 31 March 1360 – 19 July 1415) was the Queen of Portugal from 1387 until 1415, by marriage to King John I (Portuguese: João de Portugal). Born into the royal family of England, her marriage secured the Treaty of Windsor (i.e., one of the reasons we love England to this day).
The marriage itself, as was usually the case for the nobility in the Middle Ages, was a matter of state and political alliance, and the couple did not meet until twelve days after they were legally married. Philippa was considered to be rather plain, and King João I (John I) already had a mistress, by whom he had three bastard children.
Still, they've bonded so strongly that he drop his mistress and became a very loyal and dedicated husband (he never had any other mistresses). The same happened with Portugal also, since Phillipa became one of our most loved queens ever. She's still loved to this day, not only because she bonded with the country and was an awesome and bright queen, but also to her heritage as a woman, mother and ruler. We really couldn't have a better queen.
At the age of 55, Philippa fell ill and died due to the plague. Though he had been reluctant to marry her, the King had grown quite fond of his wife, and it is said that he was so grieved by her illness that he could neither eat nor sleep. Before dying, the King expressed the wish that he should be buried next his Queen holding hands, so they could "be together for all eternity, as they were in life".
