Both Uses

although
in
All's Well That Ends Well, by Shakespeare
(Auto-generated)

Although before the solemn priest I have sworn, I will not bed her.†
Scene 2.3

although = even though -- used to connect contrasting ideas
no, no, although The air of paradise did fan the house, And angels offic'd all: I will be gone, That pitiful rumour may report my flight To consolate thine ear.†
Scene 3.2 *

Definitions:

(1) (although)
even though -- used to introduce an idea that contrasts with or makes the main statement surprising

At the start of a sentence, although can play a role similar to words like however, yet, still, even so, on the other hand, or nonetheless—all of which signal contrast. In the middle of a sentence, although can sometimes be used where but or though might also work, but though or but often sound more natural. For example, "She's a great teacher, though not the most popular" is usually smoother than "She's a great teacher, although not the most popular."
(2) (meaning too rare to warrant focus)