Columbia subject headings:
Art, Medieval--Italy.
Artists' marks--Italy.
Harvard subject headings:
Art, Medieval--Italy--Siena.
Artists' marks--Italy--Siena.
Christian art and symbolism--Italy--Medieval, 500-1500
Liturgical objects--Italy--Siena.
Princeton subject headings:
Art, Medieval--Italy--Siena.
Artists' marks--Italy--Siena.
Christian art and symbolism--Italy--Medieval, 500-1500.
Liturgical objects--Italy--Siena.