Did the Orthodox Christian church have any equivalent to the Protestant movement?

Patriarch Cyril Lucaris made overtures towards Calvinist theologians in the 1620s, and many though not all specialists believe he was pursuing a reform of the church along Calvinist lines. His contemporaries certainly thought so, and attributed the Calvinist Confession of Cyril Lucaris to him.

The Synod of Jerusalem (1672) repudiated both the Confession, and Cyril’s authorship of the Confession, three decades after Cyril’s execution.