How to portray a Spartan king from the classical era?

[hoplite14gr]

Yes Peter 2 bodyguards are more than enough.

Except the kings the leaders of Spartan expeditionary forces had the privilege of bodyguards probally Pythian winners as we deduct from fragments of Xenophon's "Laconian constitution".

Also the Royal stichos (file) in the phalanx would probably be composed from men of the Aigidae clan who carried the snake.
The clan had royal affiliations ans probably a legitimate claim to the throne.

Reconstruction of Thermopylae 1st day for refernce:
http://www.spartan-world.de/sparta.html click hoplites, click heraldry
Kind regards