The Five Hundred Year Diary was a journal kept by the Doctor.
According to one account, the First Doctor began writing the diary whilst still on Gallifrey, but left it there when escaping with Susan. It was returned to him by his mentor K'anpo Rimpoche, shortly before the Doctor's regeneration into his second form. (PROSE: The Three Paths)
Another account had the Doctor writing in his Five Hundred Diary from his stay at 76 Totter's Lane onwards. (PROSE: Extracts from the Doctor's 500 Year Diary) He hid the diary in the lower compartment of the astral map. To the Eighth Doctor's surprise, Susan knew the Doctor's hiding place during their original travels. (AUDIO: The Shoreditch Intervention)
By the final time of his fifth incarnation, the Doctor confessed to Peri Brown he tried keeping a diary, not chronological, but "the trouble with time travel is one never seems to find the time". (TV: The Caves of Androzani)
- It is disputable if he was referring to the Five Hundred Year Diary.
By the time he was travelling with Lucie Miller, the Eighth Doctor had the Five Hundred Year Diary in the TARDIS library. He used the book to pinpoint which species of alien was threatening Little Morton. He was able to correctly guess that he was dealing with a Quitoxin. (AUDIO: The Young Lions)
The Eighth Doctor later checked his "secret diary" to confirm his first incarnation's activities on 7 August 1963. He learned that the First Doctor had been relocating the Hand of Omega. (AUDIO: The Shoreditch Intervention)
Further diaries Edit
The Tenth Doctor had a psychic diary written on psychic paper. He explained to Christina that it held everything he saw and felt. The Doctor kept this diary on a desk in the TARDIS's library, but due to a cloud layer in the library's upper stacks, the desk was rained on no matter where it was placed. The Doctor was forced to use a saucepan to catch the rain so it didn't moulder the psychic paper and produce psychic mould and psychic mushrooms. (PROSE: Keeping up with the Joneses)
The Eleventh Doctor had a Twelve Hundred Year Diary, which he and Clara read it when the Doctor forgot everything about himself. His memories were returned after reading the book. (TV: The History of the Doctor)
Other references Edit
Scandrius, a Time Lord who idolised the Doctor, carried a Five Hundred Year Diary of his own which he wrote while briefly travelling with Tegan Jovanka in a TARDIS that he stole. (AUDIO: Time in Office)