In Medieval Latin

The term iambic tetrameter originally applied to the quantitative meter of Classical Greek poetry, in which an iamb consisted of a short syllable followed by a long syllable. Two iambs, or a spondee and an iamb, were joined to make a "metron". In Greek and Latin iambic poetry the first syllable of each iambic metron could optionally be long instead of short.

An example in Latin is the hymn Aeterne rerum conditor composed in the 4th century by St Ambrose, which begins:

Aetérne rérum cónditór,
noctém diémque quí regís, ...

"Eternal Creator of (all) things,
Who rulest the night and day"

The two lines above consist of the following rhythm, and joined make a tetrameter:

| – – u – | – – u – |

| – – u – | u – u – |

Latin poetry was quantitative, i.e. based on syllable length not stress accent, and in places the word-accent does not match the metrical accent (e.g. noctém and regís). In Ambrose's hymn, there is a strong break at the end of each half of the tetrameter, so that it is usual to write the two halves of the verse on separate lines.

In early Latin

The iambic tetrameter was one of the metres used in the comedies of Plautus and Terence in the early period of Latin literature (2nd century BC). This kind of tetrameter is also known as the iambic octonarius, because it has eight iambic feet.^[1] There were two varieties. One had a break at the end of the second metron as in Ambrose's hymn. In some lines, however, such as the following from Terence, the break came after the 9th, not the 8th, metrical position:

at tú mihi cóntra núnc vidére fórtunátus, Phaédriá!^[2]

"But you on the other hand now seem to me to be lucky, Phaedria!"

| – – uu – | – – u – | u – – – | – u – |

A characteristic of iambic metre in early Latin was that even the short elements in the metre were often replaced with a long syllable, as with tun in fórtunátus, or two short ones, as with mihi above; but if so, they were usually unaccented to give the impression of being short.^[3] There was usually therefore quite a strong match between word accent and rhythm, as in the line above.

A variation on this metre was the iambic septenarius, or iambic tetrameter catalectic. This was similar but with the last syllable omitted. The example below also comes from Terence:

sed quíd hoc est? vídeon' égo Getám currént(em) huc ádveníre?^[4]

But what's this? Do I see Geta running to arrive here?

| – uu – uu | – uu u – || – – – – | u – – |

The final syllable of the line could be long or short, but every final syllable counted as long by the principle known as brevis in longo.

English

 ×    /    ×    / ×    /  ×  /
Come live with me and be my love

(Christopher Marlowe, "The Passionate Shepherd to His Love")

German

 ×    /   ×  /    × /  ×       /
Dies Bildnis ist bezaubernd schön[5]

(Emanuel Schikaneder, libretto to The Magic Flute)

Hebrew

× /  × /  ×  /   × /
Adon Olam Asher Malach[6]

(the opening line of Adon Olam, a traditional hymn of anonymous authorship from the Jewish liturgy.)