This volume is dedicated to Taddeo di Bartolo (c. 1362-1422), painter of Sienese origin who, as the travelling master he was, spent a good part of his career moving betweenTuscany, Liguria and Umbria, serving politically and economically powerful families, public authorities, large religious orders and brotherhoods.He was responsible for imposing altar polyptychs, a sacred art form of which he was the undisputed master: the re-composition of some of these apparatuses, such as the now dismemberedaltarpiece of San Francesco al Prato in Perugia, constitutes the fulcrum of the studies gathered in these pages.The book also documents Taddeo's other fields of activity: from the creation of processional banners to small tables of private devotion, up to the important role as fresco painter with the decoration of the chapel of the Palazzo Pubblico in Siena. With historical essays and documentary apparatuses, the volume edited by Marco Pierini and Gail Solberg - the painter's most accredited scholar - is therefore a complete and updated monograph on the figure of the artist.Authors of the essays: GailSolberg, Marco Pierini, Emanuele Zappasodi, Veruska Picchiarelli, DonalCooper, Alberto Sartore, Machtelet Brüggen Istraëls, Christa Gardner von Teuffel, Daniele Costanti.Text in English and Italian.