a disyllabic foot, if accented on the second syllable is called an Iambus, if on the first syllable a Trochee.
Iambic lines:
With ravished ears
The Monarch hears;
Assumes the god,
Affects to nod. Dryden
Trochaic lines:
Rich the treasure,
Sweet the pleasure. Dryden
from Daniel, the Rev Canon (1904) The Grammar, History and Derivation of the English Language, London: National Society's Depository