What is "mezzastris"

Mezzastris (Mezastris, Mezzastri) was the family name of two Umbrian painters who worked in the Foligno area.

• Pier Antonio Mezzastris (or Pierantonio) was the more famous, and the one usually meant when no first name is indicated
• Bernardino Mezzastris (or Belardino), possibly the son of the preceding, was a much lesser painter