The Doctor (The Brain of Morbius)

According to one account, before leaving Gallifrey, the Doctor lived through several incarnations as Patience's husband. He came from a family of explorers, and he not only led an expedition into deep time but also was one of the first Gallifreyans to enter the Time Vortex. (PROSE: Cold Fusion, AUDIO: Cold Fusion)

Biography
His father was part of the Supreme Council. (PROSE: Cold Fusion)

In an alternate universe, after Patience was widowed by Omega, she became the Doctor's tutor, just as she had been his grandfather's tutor and his father's tutor. (PROSE: Cold Fusion)

Patience married her husband on the day after he returned from his expedition into deep time with the Machine. They fell in love and had thirteen children, living together in secret at Patience's ancestral home, the House of Blyledge. (PROSE: Cold Fusion)

Patience remembered this incarnation newly regenerated, before his hands had even touched her body. He was taller and hairier than his previous, beardless body. He had a blond curly head and a beard which was much darker and coarser. He considered himself old, and was on the Supreme Council as his father was before him. At this time, his firstborn son was a Cardinal and a Time Lord of the first rank, whose wife was expecting to give birth to their first grandchild. (PROSE: Cold Fusion)

As only the Loom-Born were allowed to inherit the Legacy of Rassilon, the then-Lord President sent Chancellery Guards to terminate the pregnancy and seize the family. (PROSE: Cold Fusion)

They culled Patience's twelve children, but Patience was placed in the Machine for safety (PROSE: Cold Fusion) with her grandchild by the First Doctor. Eventually his eldest son had a daughter; the First Doctor was present at her birth, having transgressed the laws of time by travelling to the ancient past.

Though the explorer was honoured among the Time Lords of the Doctor's time, they had forgotten his true name; however, the Fifth Doctor recognised it. (PROSE: Cold Fusion)

Behind the scenes
In his reference book, AHistory, character's creator Lance Parkin unambiguously referred to the incarnation from Cold Fusion as the Douglas Camfield incarnation''.