Foden had been the long-standing head teacher at Ysgol Friars in Bangor, Gwynedd, and for a time a strategic head at another school in the county.
He was arrested in September 2023 after one of his victims showed an adult a photo of themselves with Foden and screenshots of sexually explicit text messages.
His trial heard how he groomed and abused his victims between January 2019 and September 2023, assaulting them in locations that included his car and hotel rooms.
He was found guilty of causing or inciting child sexual activity, attempting to arrange the commission of a child sex offence, sexual communication with a child, possession of indecent photographs of a child and sexual assault of a child.
Judge Rhys Rowlands said Foden was a “bombastic and domineering character” with “an obsession with young teenage girls”.
It also emerged during the trial that concerns were first raised to Cyngor Gwynedd about Foden in 2019 by a senior member of staff, but they were “dismissed out of hand” and no investigation took place.
The judge called it “very concerning” – and suggested during sentencing that the lack of action may have “emboldened” him to continue his behaviour.
