Does anyone know the title and author of this text?

Question

Cumba populorum capax succubuit uni; sedit, et gravior ratis utrimque Lethen latere...It starts like that. I;m looking for the rest. Hope you can help me!

Answer 1

It's from 'Tragoediae' by Lucius Annaeus Seneca [the Younger] (4 BC-65 AD). The only on-line text I can find is at Google Books, http://books.google.com/books?id=YL5LAAA...