Question

why did the Trojons build a strong wall round the city​

Answer 1

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In the Iliad, Homer describes Troy as 'well-founded', 'strong-built' & 'well-walled'. ... Indeed, in Greek mythology the walls were so impressive that they were said to have been built by Poseidon and Apollo who after an act of impiety were compelled by Zeus to serve the Trojan king Laomedon for one year.

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Answer 2

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In the Iliad, Homer describes Troy as 'well-founded', 'strong-built' & 'well-walled'. ... Indeed, in Greek mythology the walls were so impressive that they were said to have been built by Poseidon and Apollo who after an act of impiety were compelled by Zeus to serve the Trojan king Laomedon for one year.