Minimum version of Delphi to build Metropolis UI Apps?

Question

What is the minimum version of Delphi needed to build Metropolis UI apps for windows 8? Clearly the latest version has it...but what about earlier versions, when was this feature added?

I am trying to get a sense of how mature the support for this feature was in XE4, but my googlefu was failing me.

Answer 1

The Metropolis UI feature was added in Delphi XE3.