Not so obscure.

[Derrick Stephenson]

1) My Latin origins tend to make me volatile.
2) I'm distantly related to Castor and Pollux.
3) I have a connection with the film 'Ben Hur'.
So what am I ?
Not too difficult People,
Derrick.

[HighlandSniper58]

I'm going to make a wild guess at this based on only clues 1 & 3 because I haven't got a clue about Castor & Pollux.

Is it the Human Torpedo/Chariot midget submarine of WW2, developed by the Italians and later perfected by the Royal Navy?

[Derrick Stephenson]

Yea Highland Sniper, you got it.
Castor and Pollux are the heavenly twins (stars are named after them), i.e. two riders.
Well done,
Derrick.

[HighlandSniper58]

Now I did look at it like that, then I thought that twins was just too obvious, especially knowing your cryptic clues.

[Bombardier]

Yes well done clever cloggs, LOL dr;