Lady Sybil Deirdre Olgivanna Ramkin lived alone, but for the usual collection of servants and dragons, in a large house in the better part of AnkhMorpork.  Until the day she met Sam Vimes (Guards, Guards!).  After some interesting adventures involving a magic dragon, a mob and the Watch, Sam and Sybil got to know each other better over a nice dinner.  (And an elderly drooling dragon who rested his head on Sam's lap.)  Later, she became the Duchess of AnkhMorpork when she married Sam.

Sybil is a nice gel though rather large in build.  She tended to be a somewhat shy and quiet girl at school because of her size and upbringing.  She has a mass of chestnut coloured hair which is actually a wig becuuse of fire damage from clos proximity to swamp dragons. She breeds her own dragons and is also involved in the running of the Sunshine Sanctuary for Dragons in Morphic Street.

Sybil loves her husband dearly, though he has a distressing habit of always being late for important events and being a workaholic, leaves her alone for long periods of time.  When she was expecting their son, it took her several attempts before she was able to capture his attention long enough to tell him.  (The Fifth Elephant)  Of all the characters in the Discworld, I love Sybil the most, probably because I can identify with her so strongly.  I hope that Sam eventually notices what a lovely wife he has and stops neglecting her so disgracefully.  And that she continues to have a long and happy life, raising her son and her dragons.