Jack knew little about Gallifrey past what he'd learned from the Doctor. But he'd heard the name Rassilon before when the Doctor told him about the time used on the planet. So he had to be important. He had to be someone very very important.

Even when Jack was out of his depth, he couldn't help but have his breath taken away by somewhere that seemed like it must be monumental.

"Not a language?" he asked with a frown. "A code maybe? More riddles?"