Celtic legend Neil Lennon has revealed to BBC Sport that he used to consider Barry Ferguson as his Rangers "nemesis" during their feisty Old Firm meetings.
Ferguson came up against the Northern Irishman plenty of times over the course of his two spells at Rangers, in which the Scot and Lennon often found themselves right at the heart of the spicy Glasgow derby.
The pair had similar on-the-pitch personalities which meant that meeting one another was often a subplot in Celtic - Rangers games down the years.
But although Lennon recalls the Rangers legend as his "nemesis", the 45-year-old, who went on to manage the Bhoys for four years, says there was always plenty of mutual respect between the no-nonsense duo.
"When you have a nemesis, you have to put your marker down, in Old Firm games especially," Lennon told BBC Sport. "You put your marker down early.
"Barry would've gone for me and I would've gone for Barry because we were seen as the two leaders in the team.
"I had total respect for Barry. I thought he was a fantastic player - technically superb, could see a pass.
"We had words on the pitch and then it was forgotten about afterwards. There was a real high level of respect there."
Celtic and Rangers fans might be hoping that Scott Brown's imminent rivalry with Joey Barton can throw up similar fireworks.
Barton joined the Gers this summer on a two-year deal and has already whet the appetite for the first Old Firm clash at Parkhead on September 10 by suggesting he is a level about the Hoops skipper as far as talent goes.