Miguel Servet and pulmonary circulation Historical milestone · Villanueva de Sigena, Los Monegros, Huesca Image of Villanueva de Sigena, not of the place itself. Born around 1511 in Villanueva de Sigena, Miguel Servet described the pulmonary circulation of the blood in his work Christianismi Restitutio. His anti-Trinitarian theses earned him condemnation and the stake in Geneva in 1553. His birthplace was restored and can be visited. 1511-1553 Photo: Medol (CC BY 4.0) What to see and do in Villanueva de Sigena