The earliest inclusion of the rapier in an official D&D/AD&D product (that I know of) is 2e's The Complete Fighter's Handbook. Someone could correct me if it appeared earlier than that.Sometimes I wonder at one point it was decided that a rapier was a suitable weapon for fighting dragons.
Is the rapier really any less appropriate than a hand crossbow or a lucern hammer for fighting dragons.Sometimes I wonder at one point it was decided that a rapier was a suitable weapon for fighting dragons.
I prefer to call it the canolier.
It was meant to let people play as swashbucklers, scientifically proven to be the sexiest of all melee combatants.Sometimes I wonder at one point it was decided that a rapier was a suitable weapon for fighting dragons.
Are you thinking of an actual rapier, or of a fencing foil? I used to think that foils were rapiers.Sometimes I wonder at one point it was decided that a rapier was a suitable weapon for fighting dragons.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.