Commodus ordered Lucilla 's execution after a failed assassination and coup attempt when she was about 33 years old .
She was the wife of her father 's co-ruler Lucius Verus and an elder sister to later Emperor Commodus .
Emperor ordered wife 's execution after a failed assassination and coup attempt when wife was about 33 years old .
She was the wife of her father 's co-ruler Lucius Verus and an elder sister to later Emperor Commodus .