Italian painter and illuminator. The superb illustration of the Assumption of the Virgin in the Caleffo Bianco (a register of state documents in the Siena Archive) and the polyptych of the Virgin and Child with Four Saints (Siena, Pinacoteca Nazionale) are signed by Niccolò di ser Sozzo. The polyptych is also signed by Luca di Tommè with the date 1362. In 1348 Niccolò was in debt to the Siena Comune, and in 1363 he was mentioned in the city's Libro delle Arti. He has been associated with documents referring to services undertaken on behalf of the Siena Comune, but these relate to the son of a notary, ser Sozzo di Francesco Tegliacci. The painter of the signed miniature and polyptych was probably the son of an obscure Sienese illuminator, ser Sozzo di Stefano. //