The Treaty men had to win their final two games to avoid the drop, and they were value for this one as 14-man Louth suffered their second relegation on the bounce.
Ryan made sure the visitors retired at half-time with the slenderest of leads, but the 0-7 to 0-8 scoreline flattered the hosts somewhat.
Colin Kelly must have lit a fire under his Louth players at half-time as they returned with much more urgency, and Derek Crilly and Ryan Burns overturned their half-time deficit. But a goal from Limerick’s Peter Nash goal settled the Munster men.
Ryan followed up with a free to put three between the sides, and there was still a goal in it, 1-11 to 0-11, by the time Kevin Toner was sent off after clashing with Ryan.
The St Senan’s man then teed up Pa Ranahan for Limerick’s second goal, making it 2-12 to 0-11. Ryan Burns - Louth’s best player - fired a goal , but the second from Conor Grimes came too late.
R Burns 1-4 (3f), C Judge 0-3 (1f), C Grimes 1-0, D Crilly 0-2, D Maguire, E O’Connor.
I Ryan 0-8 (6f), P Nash 1-1, P Ranahan 1-0, I Corbett, R Browne, D Neville, G Hegarty 0-1 each.
C Grimes for Stewart (30), R Moore for Byrne (53), S O’Hanlon for Crilly (55), D O’Connor for E O’Connor (59).
C Sheehan for Riordan (46), S O’Dea for Cahill (66), M Brosnan for Nash (69), J Lee for Ryan (70).
N Gallagher; K Toner, P Reilly, P Rath; A Williams, D Finnegan, J Stewart; B Duffy, E O’Connor; C Judge, D Byrne; R Burns, D Crilly, D Maguire.
B Scanlon; S Cahill, J McCarthy, R Browne; I Corbett, P Browne, P Renehan; T Lee, G Hegarty; J Riordan, D Tracey, C Fahy; P Nash, S Buckley, I Ryan.
M McNally (Monaghan).