The Master of Sienese Grace In the luminous era of the Italian Quattrocento, few names evoke the delicate transition from the medieval to the modern as poignantly as Stefano di Giovanni, known more affectionately to history as Sassetta. A pivotal figure of the Sienese School, his artistry represents a profound bridge between the decorative elegance of the Late Gothic period and the burgeoning realism of the Renaissance. While the exact origins of his life remain shrouded in the mists of time—with scholars debating whether he was born in Siena or perhaps Cortona—his presence in the Tuscan lan…