1. In a large bowl combine chicken quarters, garlic, oregano, pepper and coarse salt to taste, vinegar, olive oil, prunes, olives, capers and juice, and bay leaves. Cover and let marinate, refrigerated, overnight.
2. Preheat oven to 350 degrees.
3. Arrange chicken in a single layer in one or two large, shallow baking pans and spoon marinade over it evenly. Sprinkle chicken pieces with brown sugar and pour white wine around them.
4. Bake for 50 minutes to one hour, basting frequently with pan juices. Chicken is done when thigh pieces, pricked with a fork at their thickest, yield clear yellow (rather than pink) juice.
5. With a slotted spoon transfer chicken, prunes, olives and capers to a serving platter. Moisten with a few spoonfuls of pan juices and sprinkle generously with parsley or cilantro. Pass remaining juices in a sauceboat.
6. To serve Chicken marbella cold, cool to room temperature in cooking juices before transferring to a serving platter. If chicken has been covered and refrigerated, allow it to return to room temperature before serving. Spoon some of the reserved juice over chicken.