The first Gothic seaborne raids took place in the 250s. The first two incursions into Asia Minor took place between 253 and 256, and are attributed to Boranoi by Zosimus. This may not be an ethnic term but may just mean "people from the north". It is unknown if Goths were involved in these first raids. Gregory Thaumaturgus attributes a third attack to Goths and Boradoi, and claims that some, "forgetting that they were men of Pontus and Christians," joined the invaders. An unsuccessful attack on Pityus was followed in the second year by another, which sacked Pityus and Trabzon and ravaged large areas in the Pontus. In the third year, a much larger force devastated large areas of Bithynia and the Propontis, including the cities of Chalcedon, Nicomedia, Nicaea, Apamea Myrlea, Cius and Bursa. By the end of the raids, the Goths had seized control over Crimea and the Bosporus and captured several cities on the Euxine coast, including Olbia and Tyras, which enabled them to engage in widespread naval activities.