In The Horoscope of Emperor Baldwin II Filip Van Tricht presents a microstudy of political, social and cultural life in Latin-Byzantine Constantinople and Romania. A ‘new’ set of sources is used to question the traditionally negative view of the Byzantine capital under Latin rule.Combined with an analysis of other underused historical materials, mid-13th century Latin-Byzantine Constantinople is redefined as a city that—in spite of the Western conquest during the Fourth Crusade—remained dynamic, with vibrant internal and international politics, and with interesting developments in the social, religious, artistic, and scientific spheres. Against the background of a shared Roman past the metropolis on the Bosporus became a fascinating laboratory of Latin-Byzantine interaction.