The Poseidonians forgot the Greek language 
after so many centuries of mingling 
with Tyrrhenians, Latins, and other foreigners. 
The only thing surviving from their ancestors 
was a Greek festival, with beautiful rites, 
with lyres and flutes, contests and wreaths. 
And it was their habit toward the festival's end 
to tell each other about their ancient customs 
and once again to speak Greek names 
that only few of them still recognized. 
And so their festival always had a melancholy ending 
because they remebered that they too were Greeks, 
they too once upon a time were citizens of Magna Graecia; 
and how low they'd fallen now, what they'd become, 
living and speaking like barbarians, 
cut off so disastrously from the Greek way of life.
Constantine P. Cavafy
http://www.poemhunter.com/poem/poseidonians/