The case of the letter 'T'

I saw Ray sneaking around (in his own home?) and thought it was a little bit suspicious. He tried to shake me off, claiming that he was playing a game with some of the knights. But I didn't give up so finally he explained.

First, he showed me a picture. A rather old picture of three high school boys. He asked me if I recognized them, and I said I didn't. And then he scribbled some stuff above their heads: "T", "R" and "Godel". So ah! It's uncle Godel! It's Li's father!
...But Ray was more interested in what he didn't know yet. He wasn't sure with the other two, but their names definitely started with a 'T' and an 'R'. He was particularly interested in this 'T' person, since there've been talk around the castle about him and yet nobody was willing to tell Ray about it.

I was pretty interested and curious as well.... So I joined him in this mystery case! >:D the case of the letter 'T'.