How many letters does the top answer for “wrote trajan's bridge” have?

The most common answer is damascus (8 letters).

Crossword clue: wrote trajan's bridge

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

damascus 8 letters wd-fact-v3

an ancient city (widely regarded as the world's oldest) and present capital and largest city of Syria; according to the

author of trajan's bridge 50% similar → damascus

wrote a view from the bridge 50% similar → miller

wrote the bridge on the drina 50% similar → andric