Mezzastris (Mezastris, Mezzastri) was the family name of two Umbrian painters who worked in the Foligno area.
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Pier Antonio Mezzastris (or Pierantonio) was the more famous, and the one usually meant when no first name is indicated
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Bernardino Mezzastris (or Belardino), possibly the son of the preceding, was a much lesser painter