|LV= County Championship Division One, Emirates Old Trafford|
|Lancashire 650-6 dec beat Northants 180 and 270 by an innings & 200 runs|
|Lancashire 8 pts, Northants 1 pt|
Lancashire spinner Simon Kerrigan claimed the final two wickets as Northants suffered their seventh Championship defeat in a row.
Left-armer Kerrigan finished with 4-76 as the visitors were all out for 270 to lose by an innings and 200 runs.
He had Graeme White lbw and finished the game off by seeing Muhammad Azharullah caught by Paul Horton.
Andrew Hall was left unbeaten on 50, but his side are now 68 points adrift at the bottom of Division One.
Lancashire remained eighth in the table following their victory, but only two points behind Sussex and five behind sixth-placed Warwickshire.
They have only won once by a bigger innings margin since the start of the century, having beaten Durham by an innings and 228 runs at Chester-le-Street in 2005.
Resuming on 231-8, Northants lost White to Kerrigan's first ball of the morning, but Hall and Azharullah kept Lancashire waiting with a last-wicket stand of 34.
Azharullah hit two consecutive sixes off Kerrigan and Hall brought up his half century off 93 balls with a boundary off Wayne White, the seventh of his innings.
Their enterprising partnership finally came to an end when Azharullah attempted to sweep Kerrigan and Horton ran back from slip to take a top edge.
Lancashire coach Gary Yates:
"I think the win gives us belief back that we can play good cricket and win games like we did last year.
"The players will feel good about themselves because they've played some positive cricket. The victory will give everybody a lift."
Northants captain Stephen Peters:
"It is difficult for us to take much from this game. There was some resistance in the second innings and Andrew Hall's played really well not to be dismissed in the match.
"We managed to take the match into the fourth day, albeit only just, but it was always going to be difficult in the second innings as the pitch began to turn more."