commissioned Domenico di Bartolo's first work, the answer remains entirely ambiguous. However, researcher Carl Strehlke observes and concludes that two likely candidates to consider in this aspect are Casini and Bartoli, both of whom were Bishops of Siena from 1408 and 1427 respectively. Both Casini and Bartoli were close to Bernardino da Siena, and back then Bartoli was the rector of the Hospital of Santa Maria della Scala from 1410 to 1427. Bernardino promotes Bartoli's position to a Bishop as a means to draw closer the relationship between the city's church and the hospital Santa Maria della Scala (Siena). The Sigismund Plaque (1434) In 1434, Domenico also conceived and designed a fresco panel with the representation of Emperor Sigismund Enthroned (Sigismund, Holy Roman Emperor) for the Siena Cathedral, however the specific date of completion remains unknown. Art critic and historian Cesare Brandi has praised Domenico's fresco panel in his writings because of its Florentine qualities. Similar to Domenico's Madonna of Humility, which was completed less than a year before the commission of the panel had begun to take form. The plaque of Emperor Sigismund is drawn with a simple semi-circle composition. Brandi comments of the architecture of the fresco panel, for although it is not entirely correct in perspective, it can be successfully viewed from below. Carl Strehlke comments on the image of the Emperor as a hierarchal presentation of Emperor Sigismund's court because he, like a Saint or Madonna, is depicted with significantly greater height in comparison to the other figures in the art piece. Domenico also utilizes symmetry principles for the fresco's composition- as observed, the man with the hat on the left is mirrored by another on the right. There are aspects of this fresco panel that can be seen again in Domenico's later on works, such as the fresco of the Papal Grant of Privileges to the Hospital in the Santa Maria della Scala (Siena). Adult career From the works completed by Domenico in the later part of his thirties, only three paintings from these years have managed to survive. First, a Perugia altarpiece for Santa Giuliana. Second, a signed and dated Madonna and Child in the Johnson Collection, and finally, a small Madonna del Refugio in Siena. Domenico also frescoed the walls of the sacristy in the Siena Cathedral, however a very tiny fragment of them have managed to survive until today. Researcher Carl Strehlke