Yassıada

thumb|right|300px|Yassıada in 2014 thumb|300px|right|John the Orphanotrophos sends Constantine Dalassenos into exile on Plate (Yassıada) - miniature from the [[Madrid Skylitzes]]

Yassıada (Turkish: Flat Island), officially renamed Democracy and Freedom Island (Turkish: Demokrasi ve Özgürlükler Adası) in 2013, is one of the Princes' Islands in the Sea of Marmara, to the southeast of Istanbul. In Byzantine times, it was known as Plati (). It should not be confused with Yassi Ada, a different island in the Aegean Sea.