In Season Of Mists, Dream visits Hob Gadling 99 years early because he is about to journey into Hell and is unsure when, or if, he will return.
When Dream arrives, Hob is dreaming about fixing Queen Elizabeth’s computer. The hard drive on the computer has crashed, but according to Hob it’s still better than “Roger Bacon’s Mechanical Head.”
This is in reference to a story about Roger Bacon, who was a friar in the 13th century. Sometime between 1214 and 1294 (and likely somewhere in the middle, since he was born in 1214 and died in 1294) Bacon built a mechanical head. This head supposedly was built with gears, similar to a watch.
One night Bacon decided to go sleep and told his apprentice to immediately wake him if the head did anything. Deep into the night, the head spoke, and said, "Time is." The apprentice was too scared to wake Bacon and so he did nothing. About 30 minutes later the head spoke again, saying, "Time was." Again, the apprentice did not wake Bacon. The head then spoke a third time, saying, "Time past." The head then fell onto the floor and broke. Bacon could not repair the head, and it never worked in any capacity again.
In Hob’s dream, Queen Elizabeth “Time Is, Time Was, Time’s Past, Sir Robert” which reflects what the mechanical head said.
Queen Elizabeth appears in Hob’s dream in Sandman # 22 on page 16, in panel 2-3.