According to the Ethnologue (Lewis et al., 2015), the three dialects to the South of the Danube were developed between the 5th and the 10th century, while according to Rosetti (1966), this process took place after the 10th century.
according to Rosetti (1966), Aromanian and Megleno-Romanian developed in the 11th century, while Istro-Romanian developed in the 13th century.