In Mar 1641 James Dillon 1st Earl Roscommon (age 91) died. His son Robert Dillon 2nd Earl Roscommon succeeded 2nd Earl Roscommon. Anne Strode Countess Roscommon by marriage Countess Roscommon.

In 1642 James Dillon 3rd Earl Roscommon (age 37) died. His son Wentworth Dillon 4th Earl Roscommon (age 4) succeeded 4th Earl Roscommon.

In 1642 Robert Dillon 2nd Earl Roscommon died. His son James Dillon 3rd Earl Roscommon (age 37) succeeded 3rd Earl Roscommon.

Wentworth Dillon 4th Earl Roscommon died. His uncle Carey Dillon 5th Earl Roscommon succeeded 5th Earl Roscommon.