When Horatio first joined the Navy and boarded the Justinian, he wore on his person a cameo that was later torn off him by Jack Simpson – while I think I have written about this before, I cannot recall if I ever made an official post about it. Long and short of it though, is that was a cameo of his mother – and the only one. 

After his ‘inquisition’ Simpson kept the cameo as leverage against Horatio, though never had opportunity to utilize it as a result of Horatio’s crafty measures to counter him – as a result, the one and only object Horatio had of his mother, and the only likeness of her he ever knew, was lost to him thanks to Simpson’s actions. With his death, Horatio in a way accepted the loss of that piece of himself, and of her – but he never forgave it.