Duke of Lafões (in Portuguese Duque de Lafões) is a Portuguese title of nobility created under the decree of February 17, 1718, of King John V of Portugal and granted to his nephew, Dom Pedro Henrique de Bragança, the building force behind Palacio do Grilo and first son of Infante Miguel de Bragança, the latter an illegitimate son of King Peter II of Portugal and Anne Armande Pastre de Verger. Pedro's mother, Luisa Casimira de Sousa Nassau e Ligne was the first to use this title. The title was later passed on to his brother, João Carlos de Bragança e Ligne de Sousa Tavares Mascarenhas da Silva, the most famous Duke of this title.