"We lie to their saying in obedience."
According to Cicero, this poet's patron Scopas complained to this poet about devoting too many lines of praise to Castor and Pollux instead of his patron, and Scopas was subsequently crushed in a roof collapse. One of his poems was analyzed in the Platonic dialogue Protagoras, and this poet was the uncle of Bacchylides. His best known poem  addresses a stranger with the line "We lie to their saying in obedience." For 10 points, identify this poet from Ceos who wrote epigrams to the heroes that served at (*) Marathon and Thermopylae. 
According to Cicero, this poet's patron Scopas complained to this poet about devoting too many lines of praise to Castor and Pollux instead of his patron, and Scopas was subsequently crushed in a roof collapse.
Simonides