Spartans were not permitted to travel.

Foreigners were but rarely permitted a residence within the city: and the Spartan dislike to Athens arose rather from fear of the contamination of her principles than from envy at the lustre of her fame.

When we find (as our history proceeds) the Spartans dismissing their Athenian ally from the siege of Ithome, we recognise their jealousy of the innovating character of their brilliant neighbour;--they feared the infection of the democracy of the Agora.

This attachment to one exclusive system of government characterized all the foreign policy of Sparta, and crippled the national sense by the narrowest bigotry and the obtusest prejudice.
Wherever she conquered, she enforced her own constitution, no matter how inimical to the habits of the people, never dreaming that what was good for Sparta might be bad for any other state.

Thus, when she imposed the Thirty Tyrants on Athens, she sought, in fact, to establish her own gerusia; and, no doubt, she imagined it would become, not a curse, but a blessing to a people accustomed to the wildest freedom of a popular assembly.