Who was Lucasta?

Here's another.---Capt. Lovelace sure wrote a bunch of poems to Lucasta, but he's also mostly going away from her to one place or the other in these poems  :)  All of which makes me wonder who this Lucasta really was:
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To Lucasta, Going to the Warres

By Richard Lovelace

I.

Tell me not Sweet I am unkind,

That from the Nunnery

Of thy chaste breast, and quiet mind,

To War and Armes I fly.

II.

True; a new Mistresse now I chase

The first Foe in the Field

And with a stronger Faith imbrace

A Sword, a Horse, a Shield.

III.

Yet this Inconstancy is such,

As you too shall adore

I could not love thee Dear so much,

Loved i not honor more.