by tradition and according to tradition

[Mrxkms]

What is the difference between by tradition and according to tradition?

[Tilt]

As for me both of them sounds a bit strange, also it should be noted that I'm not saying that they are not correct, just never seen in using.Traditionally, why not?
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We are what we repeatedly do.

[Mrxkms]

well, this is the whole context for both
the context for by tradition is Robin Hood was an outlaw who hunted and stole the King's deer in the royal forest of Sherwood, near Nottingham.

While the context of according to tradition is the following:
Edwinstowe village, in which, according to tradition, Robin Hood and Lady Marion were married, is one of the visitor's favorite sites.

May I ask one more question please?
Is deer in this context singular or plural
I think its plural. isn't it?

[Tilt]

Deer" is the same in the plural as in the singular.
_________________
We are what we repeatedly do.