Given a connection on a principal -bundle the holonomy Lie algebra at a point in a total space principal bundle is the tangent Lie algebra of the holonomy group at of a principal -bundle. By the Ambrose-Singer theorem the holonomy Lie algebra is spanned as a vector subspace of the Lie algebra of spanned by all elements where is a point in connected to by some horizontal path and are horizontal vectors at .
There are particular cases related to arrangements of hyperplanes like Drinfeld-Kohno Lie algebra and its generalizations.
For higher categorical analogue see
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