These collections contain introductions and explanatory passages by the author.
The incidents of this episode were a favorite subject in the sculptures of his temples, where their representation was accompanied by a poetical version of the affair and other explanatory inscriptions.
A copy of the orders and an explanatory letter were in fact despatched to the II.
Mercury himself said the song was self explanatory, with some "nonsense" thrown into the middle.
In that case it would fall shortly before the Relief visit, to which there may be tacit explanatory allusion, in Gal.