Andred (The Invasion of Time)

One incarnation of Andredaselus (Andred for short), a Time Lord of Gallifrey, was a member of the Chancellery Guard when he met his future wife, Leela.

During the Vardan invasion
Andred was a Commander of the Chancellery Guard. He organised the Time Lords opposed to the Fourth Doctor's presidency after he had helped the Vardans invade. He attempted to kill him as a traitor but later aided him once his true intentions became apparent. Leela fell in love with Andred and stayed on Gallifrey with him, accompanied by K9 Mark I. (TV: The Invasion of Time)

Life with Leela
Most accounts agreed that Andred was eventually made Castellan. (PROSE: Lungbarrow, AUDIO: Pandora)

At some point, he and Leela got married. (TV: Arc of Infinity) Some accounts also stated that Leela then became pregnant by him, (PROSE: Lungbarrow, Jealous, Possessive) while several others contradicted this. (AUDIO: Weapon of Choice, Insurgency, etc.)

Following an incident in the Death Zone, Andred led a clean up with K9 Mark I in order to dispose of what creatures remained there. (AUDIO: Time in Office)

Andred taught Leela how to operate a staser. (AUDIO: Extermination)

Behind the scenes
At the end of Lungbarrow, the Seventh Doctor learns that Leela is carrying Andred's child. Noting that half-human, half-Gallifreyan is an "unusual pedigree", the Doctor tells her to "just call him after me". The implication is that the child will eventually travel back in time and become the Other, who ultimately dissolves himself in the Loom network to be reborn as the Doctor. Marc Platt later confirmed this: "I don't know whether anybody picked up on that little hint that this is actually a time loop! ... Yup! I'm very naughty! Leela and Andred are ... Oh, dear! Perhaps I shouldn't have mentioned it? The implications are far too horrific to contemplate!" (DWM 305)