I forgot how good it feels to make an impulse buy. SpotteD this one on
ebay as "unknown Indian ancient coin" and won it "Big Mac Meal" cheap! I recognized the Trident as coming from post-Gupta eastern India, and started digging. I came up with a rough attribution of the Chandra dynasty, Arakan kingdom. A member on another forum kindly lent a hand in reading the legend; Dhr Ti Cha Ndra.
Dhritichandra appears on the Arakan kings list as ruling from 597-600 AD, but is not otherwise known.
Best part is, neither are his large coins! This type is unpublished, and major auction archives don't have any examples of his full denomomation, just fractions. There is a decent chance this coin is unique.
India, Arakan (Burma)
Dhritichandra 597-600 AD
AR Unit 25mm, 4.18g (originally probably 27-30mm and 5-5.5g)
Obv: Zebu reclining left, wearing necklace, Dhritichandra above, all within border
Rev: Trishula topped with sun and crescent moon, surrounded by ornate border

The edges have become brittle and mostly snapped off in the past 1400 years. Fortunately, the rest of the coin is stable and nothing important was lost to the breakage.