Ostoja - is a Polish coat of arms that originally was used by the family of Ostoja from Kujavia and Greater Poland. As the family expanded their territory to Pomerania, Prussia, Lesser Poland, Slovakia, Hungary, Romania they also adopted several noble families from Lithuania, Belarus and Ukraine, finally turning into a Clan of Ostoja. As different lines of the Clan formed surnames after their properties and adding the adoptions, Ostoja become a Coat of arms used by several families not necessarily blood related with each other.