Old Time

The Old Time refers to a time on Gallifrey before Rassilon had created the Time Lord civilization. In this time, Rassilon fought the vampires throughout the Universe (DW:State of Decay) and, along with Omega, created the Eye of Harmony (DW:The Three Doctors), validium (DW:Silver Nemesis), and  the Hand of Omega (DW:Remembrance of the Daleks).

According to a possibly apocyrchall source, Gallifreyans had the ability to reproduce during the Old Time. They were cursed with infertillity and forced to create Looms. (NALungbarrow)

Lady Peinforte threatened to reveal the Doctor's secret "from the Old Time". (DW:Silver Nemesis)

''There is speculation about if this secret may be the nature of the Doctor's birth, as revealed in DW:Doctor Who: The Movie by the Doctor. Russel T. Davies, in an earlier script for DW:The End of Time, was going to discount this idea by having the Doctor say it was a "48-hour bug." (Doctor Who Confidentail)''