Regarding the term Gothic Art.
The book Art Through the Ages, Yale University, 1959 (6th ed.) mentions 'Gothic' "first used as a term of derision by Renaissance critics who scorned its lack of conformity to the standards of classic Greece and Rome. The men of the thirteenth and fourteenth centuries, however, referred to the Gothic cathedrals as opus modernum (modern art) or opus francigenum (French art)."
The same book gives the following timeline for the Gothic Art
Early Gothic (1140-1194)
High Gothic (1194-1248)
Refined Gothic (mid 13th-14th cent.)
Late Gothic (14th-16th cent.).
Another book, A History of Architecture, Sir Banister Fletcher, 1948 (14th ed.) as it is a comparative study goes into details considering styles and substyles from geographical, geological climatic religious, social, and historical factors of influence. He is therefore subdividing the Gothic architecture (in Europe) into:
English Medieval Architecture (5th-16th cent.)
Scottish Architecture (12th-18th cent.)
Irish Architecture (6th-16th cent.)
French Gothic (12th-16th cent.)
Belgian and Dutch Gothic (13th-16th cent.)
German Gothic (13th-16th cent.)
Italian Gothic (12th-16th cent.)
Spanish Gothic (12th-16th cent.)
I can try scan the chapters from both books if you are interested.
The idea is that maybe the electronic resources having lots of errors, give missleading conclusions. It is always better to look for older books that might be cheaper in hardcopy or even public domain.
One interesting note. In my honest opinion, it would be more inyeresting to start first with making sense out of the letter 'i' written instead of 1 on the old buildings. Maybe it would be a good start to draw some conclusions from the Anatoly Fomenko threads.