( fl Siena, 1350–84). Italian painter. Until the 1980s he was known only from documents, but an analysis of the fragmentary inscription on the frescoes dated 1368 in the choir of S Michele, Paganico (previously attributed to Bartolo di Fredi Cini), has shown that they were painted by Biagio (Freuler, 1981). This has enabled other works—including the restored fresco fragments of 1363 in S Mamiliano, Siena (the Camaldolese nuns’ church), depicting the Virgin and Child Enthroned with Angels and St John the Evangelist, and a giant St Christopher—to be attributed to him, and the broad outlines of his career can now be traced.