The wife of Trajan was Plotina, and she too is present along the axis of life.
The Templum Plotinae sits at the eastern extreme of the axis of life, alongside the Nymphaeum and the master key.
An anchoring of Imperial motherhood.
Trajan, on his deathbed, adopts Hadrian as his Imperial heir
The adoption is suspect because Plotina and the young Hadrian possess a special bond, perhaps even a bond of Eros.
Eros, Eros, Thanatos.