In Book 5 of Laws, Plato is singling out Hestia, Zeus and Athena while describing the ideal city:
The next thing to be noted is, that the city should be placed as nearly as possible in the centre of the country; we should choose a place which possesses what is suitable for a city, and this may easily be imagined and described. Then we will divide the city into twelve portions, first founding temples to Hestia, to Zeus and to Athene, in a spot which we will call the Acropolis, and surround with a circular wall, making the division of the entire city and country radiate from this point.
Source Laws, by Plato. Translated by Benjamin Jowett.
Why this particular triplet? And why does Hestia come first?