Heraldic flag of Podolian Voivodeship.
Kronika Marcina Bielskiego, Том 1 — Nakł. i druk K. Pollaka, 1856 — S. 13. Flag description:

Podolskie voivodship bears the sun with rays on the banner, in a white field.
Own work
Лобачев Владимир. Base: File:Recueil d'armoiries polonaises Подолье.jpg