9,2:3 Tetrapyrgia

This pass route has been intensely discussed. Hild took a four-wheel-drive vehicle over the Taurus Mountains to further his argument that the TP line represents a crossing of the range at 2,250 metres' altitude at Kemer Yayla (attained via via Yeşildere, Taşkal, Buyukkoraş, Küçükkoraş, Dedeli Yayla).

French (route 26) wants to situate the pass further west, passing through Laranda and under the ruins which are believed to be Koropissos (q.v. emendation 9,2:4), a solution which stretches the reader's credibility.

The geographical location of the pass need not concern us here. The important issue in restoring whatever line-work appeared on the original TP (or would have appeared there if its development had been rational) is the impossibly short distance of XVI m.p. from Iconium to Ad Fines.

If we combine that distance and the onward distance to Tetrapyrgia, somewhere in the middle of the Taurus, we have a total 51 kilometres northward, which does not reach any significant towns being the roadhead. With software, we can plot the distance as the crow flies from Hild's Tetrapyrgia: the resulting map plainly shows that the distance on the TP can at most be that from the Barata-Cybistra road. So the roadhead for the pass route must be a junction, not a village.

As noted in emendation 9,2:2, the TP shows six routes meeting at Iconium, a concentration which is graphically unlikely: the TP generally confines itself to three-way and four-way intersections. Tavio, higher up this section, and Rome are among the few exceptions. It is therefore both simple and plausible to detach this line from Iconium entirely, and show it as a branch of the Barata-Cybistra highway. The geographical location of the junction cannot be determined.

At the other end of the Tetrapyrgia Pass, changes have been proposed. Talbert points out: "[The Pompeiopolis symbol, TPPlace2366] is the same city as Pompeiopolis (no symbol) on the route immediately above, and as Soloe (no symbol) which immediately follows." This does not require any change to the linework, but I have adopted this simplification in my abstracts.

Both Talbert and Miller also delete a short line to Seleucia (TPPlace2340) as a supposed mistake. Talbert then adds a new "conjectured" line to Pompeiopolis (TPPlace2337). Neither of the latter two emendations seems very compelling to me.