Charles V, Holy Roman Emperor was the heir of four of Europe's leading royal houses. In 1506, he inherited the Burgundian Netherlands, which came from his paternal grandmother, Mary of Burgundy.In 1516, Charles became the king of Spain, inheriting the kingdoms first united by his maternal grandparents, Isabella I of Castile and Ferdinand II of Aragon (the Catholic Monarchs).

Charles VI (German: Karl; Latin: Carolus; 1 October 1685 – 20 October 1740) was Holy Roman Emperor and ruler of the Austrian Habsburg monarchy from 1711 until his death, succeeding his elder brother, Joseph I.He unsuccessfully claimed the throne of Spain following the death of his relative, Charles II.In 1708, he married Elisabeth Christine of Brunswick-Wolfenbüttel, by whom …