Combine the olive oil, vinegar, prunes, olives, capers, and juice, bay leaves, garlic, oregano, and salt and pepper in a large bowl. Add the chicken and stir to coat. Cover the bowl or store in a heavy duty Zip-loc bag overnight or for up to 2 days in refrigerator.
Preheat oven to 350 degrees F.
Arrange the chicken in a single layer in one or two large shallow baking pans and spoon the marinade over it evenly. Sprinkle the chicken pieces with the brown sugar and pour the white wine around them.
Bake, basting once our twice with the pan juices, until the thigh pieces yield clear juice when pricked with a fork. Bake time is approximately 1 hour give or take 10 minutes.
With a slotted spoon, transfer the chicken, prunes, olives and capers oa serving platter. Moisten with a few spoonfuls of pan juices and sprinkle generously with the parsley or cilantro. Pour the remaining pan juices in to a gravy dish