An EU-funded joint Galician-Portuguese project called Vias Romanas Atlanticas is currently underway, which traces the course of 2 of the Roman roads Braga-Lugo, via Santiago and Corunna (nos XIX and XX in the Antonine Itineraries). As part of this, a walking route is being developed. The Braga-Santiago section broadly corresponds to the Camino Portugues, so if you see snazzy new plinths and waymarks highlighting the Roman remains, this is what they are. There's an English section of the website, though the guide so far available Tui-Pontecesures is in Castilian, Galician or Portuguese. Several of their map links seem to be broken. The 'cartography' section is a detailed map drawn on Google Maps - beware that this takes a looooooong time to load.