The permanent dismissal of a trustee from their position by an order of the California Probate Court, typically initiated by a petition from a beneficiary, co-trustee, or other interested party. Under California Probate Code § 15642, grounds for removal include serious breach of trust, trustee unfitness (e.g., incapacity, insolvency), failure or refusal to act, inability to cooperate with co-trustees which impairs administration, charging excessive compensation, or other good cause. A removed trustee must cease managing the trust, provide a final accounting, and transfer trust assets to a successor trustee.