Eutocius of Ascalon (4th cent. AD) accompanied his edition of the first four books of Apollonius of Perga's Konika with a commentary. His work is relevant to the history of conic sections and important for the textual transmission of Apollonius. This new critical edition contains the first translation into a modern language and complements the Graeco-Arabic edition of the first four books of the Konika (SGA 1-2).