Conversation so far:
What is Abraham's relationship to a map publisher?
In 1564 he published his first map, Typus Orbis Terrarum, an eight-leaved wall map of the world.
what was the response of his map being published?
This map subsequently appeared in reduced form in the Terrarum (the only extant copy is in now at Basel University Library).
Were any other maps of Abraham published?
).
He also published a two-sheet map of Egypt in 1565, a plan of the Brittenburg castle on the coast of the Netherlands in 1568.
What other maps of Abraham were published?
an eight-sheet map of Asia in 1567, and a six-sheet map of Spain before the appearance of his atlas.
What is the significance of Abraham publishing his maps?
In 1578 he laid the basis of a critical treatment of ancient geography by his Synonymia geographica .

Question: What was the basis of a critical treatment that he laid out?
Self-contained rewrite: What was the basis of a critical treatment that Abraham Ortelius laid out?