Political Thought of the Ukrainian Middle Ages (Review): O.B. Kyrychok, Pysemnist iak politychnyi fenomen: zmist, atrybuty, formy reprezentatsii (na prykladi doslidzhennia pysemnoi spadshchyny Kyivskoi Rusi), K. (Ukrainskyi Tsentr dukhovnoi kultury) 2016, - D. Hordiienko (Sofiia Kyivska: Vizantiia. Rus. Ukraina, 2016)