The first martyr of Palestine was not Palestinian in 303 AD?
"§3.
The Persecution of Diocletian.
In this delightful circle and engaged in such congenial tasks, the time must have passed very happily for Eusebius, until, in 303, the terrible persecution of Diocletian broke upon the Church almost like a thunderbolt out of a clear sky. The causes of the sudden change of policy on Diocletian’s part, and the terrible havoc wrought in the Church, it is not my intention to discuss here (see below, Bk. VIII. chap. 2, note 3 sq.). We are concerned with the persecution only in so far as it bears upon the present subject. In the first year of the persecution Procopius, the first martyr of Palestine, was put to death at Cæsarea."
NPNF2-01. Eusebius Pamphilius: Church History, Life of Constantine, Oration in Praise of Constantine - Christian Classics Ethereal Library