Ptolemy makes Europe the northwest quarter of the inhabited world and puts it in familiarity with the fire triplicity, Aries, Leo and Sagittarius. The lands he lists there include Britain, Gaul, Germany, Italy, Spain and the Adriatic coast, along with parts of the Mediterranean world a modern reader would not file under Europe at all.
The chorography goes further than the quarter. Within each one Ptolemy assigns individual signs to individual countries and regions, so that a mundane reading of an eclipse in a given sign can be pointed at a particular place. That layer of the scheme was worked over repeatedly by later authorities, who agreed neither with Ptolemy nor with one another, and the sign to country tables in circulation today descend from that layered revision rather than from any single source.
Ptolemy assigns planetary co-rulers to the quarter as well as a triplicity. This entry does not name them, because the assignment made in the chorography is not identical to the ordinary triplicity lords and reporting one as the other would misstate the text.
The structural point worth keeping is that Europe in this system is a compass quarter seen from Alexandria, not a continent. It is the northwest of the world Ptolemy knew, described from outside by a Greek writing in Roman Egypt, which is worth remembering when the resulting characterisations are quoted as though they were a European tradition's account of itself.