Edzard I, also Edzard the Great was count of East Frisia from 1491 till his death in 1528.
Edzard succeeded his brother Enno in 1492. He fought with George, Duke of Saxony over Friesland and Groningen. The city of Groningen accepted him as its lord in 1506, but in 1514 renounced him again in favor of Charles of Guelders.
After he returned from a pilgrimage to Jerusalem in 1492, he took over the rule of East Frisia together with his mother Theda. After his mother died in 1494, he ruled together with his less significant brother Uko.
Edzard's rule was characterized by his energetic approach against his opponents, the East Frisian leaders Hero Oomkens from Harlingerland and Edo Wiemken from Jever, whom he quickly managed to subdue. He was also a supporter of the Protestant Reformation in his territories, through the creation of new East Frisian laws, the reform of the coinage and the introduction of primogeniture for his house, the house of Cirksena.
His foreign policies led to a three-year war against Duke George of Saxony. The war was mostly fought on East Frisian territory, and caused destruction in large areas. The city of Aurich, for example, was burned to the ground.