Murray Goodwin notched his 70th first-class century to help Glamorgan into a strong position on the opening day of their LV= County Championship Division Two clash with Lancashire at Old Trafford.
The Zimbabwean, 40, played the leading hand in the visitors' commanding score of 315-3 at stumps after they had won the toss and elected to bat first.
He finished the day on 138 not out off 245 balls, hitting 18 fours, and shared an unbroken stand of 130 for the fourth wicket with Jim Allenby, who reached the close on 68 not out.
Lancashire, who have won their last three matches to go top of Division Two by a point from Northamptonshire, selected two spinners in Simon Kerrigan and debutant Arron Lilley but the pair only bowled two maidens in 43 overs between them.
Will Bragg was the first batsman to go in the 17th over when he drove at Kerrigan and was caught at slip by Ashwell Prince, leaving the score at 43-1.
Lancashire had to wait until after lunch for their second wicket, Gareth Rees superbly caught at first slip by a diving Andrea Agathangelou off Kyle Hogg - Rees departed for 58 as Glamorgan reached 120-2 in the 36th over.
The third wicket was that of debutant Chris Cooke, who was culpable as he slapped a short ball from Kerrigan straight down Luke Procter's throat at cover just before tea with the score on 185.
Goodwin's fourth Championship hundred arrived in his 20th match against Lancashire for either Glamorgan or Sussex. He shared partnerships of 77 for the second wicket with Rees and 65 for the third with Cooke, although was fortunate to see Kerrigan put down a return catch when he was on 129 late in the day.