I can boot a Mac Pro 6.1 Cougar 10.8.5?

A new Mac Pro 6.1 six hearts will start from an external drive (connected via Thunderbolt 2) with a Mountain Lion boot volume 10.8.5? More generally, what is the oldest version of Mac OS X, which starts from the Mac Pro 6.1?

1 n °

2 10.9.1.

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