What is a cross coin?

Any of several small coins of low value formerly used in Austria and Germany. [German, from Middle High German kriuzer, from kriuze, cross (from their having originally been stamped with a cross), from Old High German krūzi, from Latin crux, cruc-.]

What was the first coin to have a Christian cross?

The first coin to feature the Christian Cross as the central motif was apparently a small bronze struck under Theodosius II, emperor of the Eastern Roman Empire in Constantinople (402-450 CE). Photo 6. Theodosius II (402-450 AD). Bronze numis. Obv: D N THEODOSIVS P F AVG, Theodosius II diademed and draped bust r. Rev: Cross within wreath.

Which coins have a long cross?

The reverse design is the same as the corresponding English issues (except for John and some Edward IV types) for example the Henry III coins have the voided long cross and coins of Edward I onwards have the solid long cross. Stewart, I.H. 1967 ‘The Scottish coinage 2nd edition with supplement.