Juliana Cornelia de Lannoy was born in Breda, the oldest child of Baron de Lannoy, a military officer in the War of the Austrian Succession. Her mother took her and her brother to live in her grandparents' house in Nijmegen; within a short span of years, all of these relatives had died. Juliana's father returned from the war and remarried. In 1758, he was appointed Governor of Geertruidenberg and took his family to live in a house on the Markt called "De Roos" (The Rose), which is now a museum. Juliana became a famous poet and playwright, praised by critics. Among her works was The Siege of Harlem (1770).