ERE, adverb Before; sooner than.
ERE sails were spread new oceans to explore.
The nobleman saith to him, Sir, come down ere my child die. John 4:49.
In these passages, ere is really a preposition, followed by a sentence, instead of a single word, as below.
ERE, preposition Before.
Our fruitful Nile
Flow'd ere the wonted season.