What the Holy
 

Kind.

Please tell me that the Holy?
A small icon with no markings.
 
Thanks in advance.
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Judging by the attire and gornostaynomu collar, it is a holy pious prince.

Maybe even St.Vladimir. (Similar?)

Looks like .. But I believe that the icon shows the Saint Prince Daniil of Moscow.

Thanks to all responded!

And can it be St.
faithful.
Prince Alexander Nevsky

It can be assumed, and Alexander Nevsky.

Portrait similarity does not specify a name.

Icon should be inscribed.

That inscription the name of the saint and sanctifies icon.