The separation of the fourth book from the third has no ancient authority. It dates from the revival of letters, and is due to the Italian scholars of the
15th century. The fourth book consists of poems of very different quality. The first is a composition in 211 hexameters on the achievements of Messalla, and is very poor. The author is unknown; but he was certainly not Tibullus. The poem itself was written in 31, the year of Messalla's consulship.
The next eleven poems relate to the loves of Sulpicia and Cerinthus. Sulpicia was a Roman lady of high station and, according to
Moritz Haupt's probable conjecture, the daughter of Valeria, Messalla's sister. The
Sulpicia elegies divide into two groups. The first comprises iv. 2-6, containing ninety-four lines, in which the theme of the attachment is worked up into five graceful poems. The second, iv. 8-12 (to which 7 should be added), consists of Sulpicia's own letters. They are very short, only forty lines in all; but they have a unique interest as being the only love poems by a Roman woman that have survived. Their frank and passionate outpourings remind us of
Catullus. The style and metrical handling betray a novice in poetical writing. The thirteenth poem (twenty-four lines) claims to be by Tibullus; but it is hardly more than a
cento from Tibullus and Propertius. The fourteenth is a little epigram of four lines with nothing to determine its authorship. Last of all comes the epigram or fragment of Domitius Marsus already referred to.
Some scholars attribute iii. 8-12 - iv. 2-6 to Tibullus himself; but the style is different, and it is best to answer the question, as Biihrens does, with a
non liquet. The direct ascription of iii. 19 - iv. 13 (verse 13, "
nunc licet e caelo mittatur amica Tibullo" - "Now grant that a lover be sent from heaven to Tibullus") to Tibullus probably led to its inclusion in the collection and later on to the addition of the third book to the two genuine ones. For the evidence against the ascription, see Postgate, Selections, app. C.
To sum up: the third and fourth books appear in the oldest tradition as a single book, and they comprise pieces by different authors in different styles, none of which can be assigned to Tibullus with any certainty. The natural conclusion is that a collection of scattered compositions, relating to Messalla and the members of his circle, was added as an appendix to the genuine relics of Tibullus. When this "Messalla collection" was made cannot be exactly determined; but it was not till after the death of Tibullus, 19 BC, and probably between 15 and 2 BC. Besides the foregoing, two pieces in the collection called
Pria pea (one an epigram and the other a longer piece in iambics) have been attributed to Tibullus; but there is little external and no internal evidence of his authorship (see Hiller in
Hermes, xviii. 343 - 349).
Charisius (pp. 66 and 105) quotes part of a
hexameter which is not found in the extant poems of Tibullus.