arbiter quotes

Chaos umpire sits, And by decision more embroils the fray By which he reigns; next him high arbiter Chance governs all.

-John Milton
  Paradise Lost (published1667), bk.2, l.681^4.

Elegantiae arbiter. The arbiter of taste.

-Tacitus
Of Petronius. Annals, bk.16, ch.18.