Ekaterina Zeklos is the Moroi Queen before Tatiana. She abdicates the throne when she feels she was too old and retires to an isolated island. After Tatiana's death, she runs the monarch tests for Tatiana's successor. She has one incisor missing and a cheeky and mischievous sparkle in her eyes, despite being over a century old. She's the one to crown Lissa in Last Sacrifice because Queen Tatiana wasn't available to crown Lissa.