One of the oldest lines of modern English verse is the so-called septenary (septenarius), having had a nearly continuous tradition from the twelfth-century Poema Morale down (in its divided form) to the present.    From Wordnik.com.  [The Principles of English Versification] Reference

Tyndarus is in mortal terror lest the trick which he has played on his master, Hegio, may be discovered, and he be consigned to work in chains in the quarries, the verse is the trochaic septenarius.    From Wordnik.com.  [The Common People of Ancient Rome Studies of Roman Life and Literature] Reference