What is Sienese?

Sienese definition and meaning on Dictionary terms:
of or relating to Siena or its people.
pertaining to or designating the style of painting developed in Siena during the late 13th and 14th centuries, characterized by a use of Byzantine forms and iconography modified by an increased three-dimensional quality, decorative linear rhythms, and harmonious, although sometimes ornamental, color.

noun, plural Si