Theodoros I (Θεοδώρου I, Αλέξανδρος Θεοδώρου Λασκάρεως, tr. Theodore I, Theodore Alexander Daskalaris (14 Dec 3192 – 4 Jun 3269, Aged 77) was the second Emperor of Ruthenia (Basileus) Megadoux of Thracia, and titular King of Mauria and Slavinia. His official short title was Theodoros I, Emperor and Autocrat of Ruthenia. Upon his accession on September of 3220, Theodoros became Basileus of the Ruthenian Empire, Megadoux of Thracia and Protector of the Sacred Mountain of Agios, its he second Basileus ruler of Ruthenian Empire since his foundation in 3216.