How to portray a Spartan king from the classical era?

[Giannis K. Hoplite]

The hippeis were the 300 Spartan bodyguards when on campaign.They were chosen by the 3 hippagretes,each one chose 100 hippeis.It doesn't seem that all of the hippeis had to have male children. However Herodotus points that out,that each of the 300 Spartans who were chosen for Thermopylae had male children. So these must not have been the hippeis. Now,in every Spartan campaign one of the Kings was in charge of the army. The king was usually fighting in the center of the Spartan phalanx,not to the right. Just usually the Spartans were placed to the right end. In Mantineia for instance,to the right were the Tegeans and just to the right of the Tegeans a tiny unit of Spartans were placed.
In Thermopylae there was not a Spartans army a portion of which would make the king bodyguard. The whole Spartan force was 300 hoplites.
In my opinion the number 300 does not mean anything in particular. It must be noted that this is a very common number when any other city or army made a special force. They may have had a religious significance,or perhaps they thought that this was the correct number of hoplites in order to be sufficient to fight and few enough to move rapidly. Throughout the peloponnesian was and perhaps earlier we see the number 300 very often,not only as a permanent force but occasionally,and usually by the name "logades". In contrats to Stefanos,I don't believe the "logades" was a city's special force,not was consisted of permanent members. When they were needed,some volunteers of the army took an oath before acting(from which took their name), and were acting as a unit until they fulfilled theit particular task.
Khaire
Giannis