Robertson said the main driving force in their title success was the supporters as the squad were determined to produce for them and end the wait.
"It's for every single one of them," he said. "It's for all them that have been through 30 years of hurt and now we've produced the trophy that they've been waiting for, for so long.
"That's what it means to all of us, that's what has driven us forward the whole season. To get that champions sign above us is what it was for."