Jonny Wilkinson guided Toulon to Top 14 glory in his last game before retirement as the French side claimed their second trophy of the season with a 18-10 victory over Castres.
Toulon, who won the final edition of the Heineken Cup earlier this month with a win over Saracens, made sure it was to be a double-winning campaign as Wilkinson kicked four penalties and a drop goal on the way to victory.
Delon Armitage also weighed in with a penalty, as a try from Max Evans, a Rory Kockott conversion and penalty were not enough for Castres on the night.
Wilkinson admitted hanging up his boots after so many years in the game will be a shock to the system but said he will leave with plenty of good memories.
He told France 2: "It's impossible, all I can do is thank everyone in the group, the coaches, it's incredible to explain, it's just a pleasure.
"I'll keep following the Top 14 because it has changed my life.
"I've spent half my life with a ball, it's going to be a huge shock after rugby but I'll have a lot of good memories with the whole of the team here."
Wilkinson opened the scoring from the penalty tee in the eighth minute but Castres quickly hit back through the only try of the game when Evans crossed three minutes later.
The Scot ran almost the length of the field to score a stunning try to tilt the match in his side's favour, with Kockott converting.
Toulon remained in touch through the boot of their former England fly-half, with Wilkinson scoring again in the 23rd and 32nd minutes either side of a Kockott penalty, before the 35-year-old fired a drop goal five minutes before the half-time whistle to put his side 12-10 ahead at the break.
Toulon then kept Castres out for the entire second period, with Wilkinson again splicing the uprights in the 54th minute, with Armitage extending the lead, which proved to be unassailable, in the 74th minute.