Battle Flag of Moldavia in Battle of Baia (1467). After the 1488 engraving Image:Kingdom of Hungary against Moldovans flag in battle.jpg and Image:Tucrcoczy Janos Campania Iancu de hunedoara.jpg. In this version, the cloth has only one color: red.
Own work

Reference: This is a vectorized version of the image from https://www.crwflags.com/fotw/flags/ro-mold.html
Alex:D