Georgina Baillie, the granddaughter of Fawlty Towers actor Andrew Sachs, submitted a statement in support of Brand.
Brand was found guilty of raping a 21-year-old fan in 2009, after meeting her following one of his stand-up shows at the Hammersmith Apollo.
The infamous Sachsgate scandal involved BBC Radio 2 prank calls with Brand and his then-pal Jonathan Ross, which were reported to have damaged Baillie's relationship with her late grandfather.
The pair left lewd voicemails for the Fawlty Towers legend, with Brand boasting about sleeping with Baillie, who was 21 at the time.
Brand apologised to her 11 years after the incident and paid for her rehabilitation after she turned to alcohol and drugs.
Baillie wrote in her character statement: "I still choose to support him as a person I know him to be."
Her words in court came days after the 41-year-old, who had a consensual relationship with Brand, told the Daily Mail that she was "disappointed" with the comedian.
She told the publication she wanted him to "own up and make the amends" after being found guilty.
She added: "I now want Russell to right the wrongs. I want those victims to get some help."
Brand's barrister, Ian Winter KC, told the court that Baillie had "as good a reason as anyone" not to support the disgraced star.
He then urged the judge to take it into consideration, and "not sentence (Brand) as the monster portrayed outside this courtroom."
After listing Brand's work supporting addiction charities, he said that "there are a large number of people who had come forward to ask and provide us with statements," but "those people were not prepared in the main to have their names entered into this process, which is completely understandable."
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He added: "But I can tell your lordship that a lot of people have been helped in very, very often life-saving ways by Mr Brand's care for them and personal time spent helping them.
"And your lordship, in that regard, will have seen the statement of Ms Georgina Baillie, who was an alcoholic and now has been sober for six years because Mr Brand both persuaded her and paid for her to go through rehabilitation."
He said that Baillie has put her name to a witness statement to the court and Mr Winter described her as "the granddaughter of the late, I would say great actor Andrew Sachs — she is the person right at the eye of the Sachsgate storm for which Mr Brand was rightly, and he accepted, rightly pilloried for, for what he said was a disgraceful prank on live radio."
A four-week trial heard how Brand preyed on women he encountered on his way to becoming one of Britain's best-known comedians, a lauded TV and radio host, and a Hollywood actor who was briefly married to singer Katy Perry.
Brand was convicted by the jury of raping a 21-year-old fan in 2009, after meeting her following one of his stand-up shows at the Hammersmith Apollo.
The woman told jurors she was a huge Brand fan and had willingly engaged in a threesome with him backstage despite having a boyfriend at the time.
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