 Immediately after Clontarf , Sigtrygg 's fortunes appear to have declined , even though he emerged with his kingdom intact . Máel Sechnaill , now again recognised as high king , was undoubtedly the battle 's main beneficiary . In 1015 , plague struck Dublin and Leinster , and Máel Sechnaill seized the opportunity to march south to burn Dublin 's suburbs . While Sigtrygg was able to ally with Leinster for another attack on Meath in 1017 , the alliance was dissolved when Sigtrygg blinded his cousin <unk> , Máel <unk> 's son and heir , in Dublin . 
