Pausanias Description of Greece 1.28.8

[8]
  The Athenians have other law courts as well, which are not so famous. We have the Parabystum (Thrust aside) and the Triangle; the former is in an obscure part of the city, and in it the most trivial cases are tried; the latter is named from its shape. The names of Green Court and Red Court, due to their colors, have lasted down to the present day. The largest court, to which the greatest numbers come, is called Heliaea. One of the other courts that deal with bloodshed is called “At Palladium,” into which are brought cases of involuntary homicide. All are agreed that Demophon was the first to be tried there, but as to the nature of the charge accounts differ.

[8] The Athenians have other law courts [ dikastēria] as well, which do not have so great a fame [ doxa]. There is the so-called Parabuston and the Triangle [ Trigōnon]; the first of the two is in an obscure part of the city, and in it the most trivial cases are tried; the second is named from its shape. The names of Frog Court [ Batrakhioûn] and Red Court [ Phoinikioûn], due to their colors, have lasted down to the present day. The largest court, to which the greatest numbers come, is called Hēliaiā. One of the other courts that deal with bloodshed is called […] Palladion, into which are brought cases of involuntary homicide. All are agreed that Demophon was the first to be put on trial there, but as to the nature of the charge accounts differ.