35-year-old Liam Clark's been in custody since his arrest last summer.
His crimes against three children date back to 1997, when he would have been about 15 - and ended in 2016. The offences include some of the most serious sexual crimes there are.
Devon and Cornwall's public protection unit says it's been a traumatic and emotional time for the victims, who are from Crediton, Torquay and one in Hampshire.
In addition to 26 years in prison, Mr Clark will also have an extended licence period of two years.
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