The 45-year-old, who played Stevie O’Hara in the BBC soap, was last month found guilty of five offences between 2004 and 2019.
During his trial at the High Court in Glasgow, prosecutors from the Crown Office and Procurator Fiscal Service (COPFS) told jurors that Robertson subjected victims to violence, threats and aggression.
COPFS said he poured a bottle of wine over the head of one woman and raped another during a campaign of “coercive and controlling behaviour”.
The serious sexual assault occurred at some point between 2018 and 2019.
His victim testified Robertson had sex with her despite her making clear she was not consenting. She described going “limp” when he was on top of her.
COPFS said Robertson “manipulated victims psychologically”, falsely telling the friends of one victim that she was mentally unstable; letting himself into her home without her knowledge or consent; sending unwanted gifts; and threatening to self-harm.
During his own testimony, Robertson admitted he was “no angel” but denied any wrongdoing.
He said he is “aware” of when a woman is consenting to sex, and is “sensitive” enough to know about non-verbal communication.
Robertson was convicted of two counts of assault; behaving in a threatening or abusive manner; abusive behaviour towards a partner or ex-partner; and rape and sexual assault.
The actor, from Stirlingshire, was sentenced at the High Court in Edinburgh on Thursday.
He was handed a 12-year extended sentence, with nine years in jail and three years on licence once released back into the community.
Robertson was additionally placed on the sex offenders’ register and handed a 99-year non-harassment order.
Procurator Fiscal Faye Cook said: “Iain Robertson held a high-profile position through his career but in private he assaulted and abused females who trusted him.
“This has caused lasting damage to the lives of people who thought they were safe around him.
“Prosecutors from COPFS were able to show his criminal behaviour carried on over a period of many years and involved a number of women.
“We are grateful that these women were ready to speak out. It is through their testimony that Robertson was brought to justice.”
