On 13 Sep 1370 Simon Fleming 1st Baron Slane (age 52) died. His son Thomas Fleming 2nd Baron Slane (age 12) succeeded 2nd Baron Slane.

In 1435 Thomas Fleming 2nd Baron Slane (age 77) died. His son Christopher Fleming 3rd Baron Slane (age 51) succeeded 3rd Baron Slane.

On 30 Nov 1447 Christopher Fleming 3rd Baron Slane (age 63) died. His grandson Christopher Fleming 4th Baron Slane (age 13) succeeded 4th Baron Slane.

On 30 Mar 1463 David Fleming 6th Baron Slane (age 40) died. His first cousin James Fleming 7th Baron Slane (age 21) succeeded 7th Baron Slane. Elizabeth Welles Countess Kildare by marriage Countess Kildare.

In 1492 James Fleming 7th Baron Slane (age 50) died. His son Christopher Fleming 8th Baron Slane (age 18) succeeded 8th Baron Slane.

In 1517 Christopher Fleming 8th Baron Slane (age 43) died. His son James Fleming 9th Baron Slane succeeded 9th Baron Slane.

In 1578 James Fleming 9th Baron Slane died. His first cousin once removed Thomas Fleming 10th Baron Slane succeeded 10th Baron Slane.

In 1601 Thomas Fleming 10th Baron Slane (age 23) died. His nephew William Fleming 11th Baron Slane (age 44) succeeded 11th Baron Slane.

In 1612 William Fleming 11th Baron Slane (age 55) died. His son Christopher Fleming 12th Baron Slane succeeded 12th Baron Slane.

In 1625 Christopher Fleming 12th Baron Slane died. His son Archbishop Thomas Fleming 13th Baron Slane (age 32) succeeded 13th Baron Slane.

In 1665 Archbishop Thomas Fleming 13th Baron Slane (age 72) died. His brother William Fleming 14th Baron Slane succeeded 13th Baron Slane. Anne Macdonnell Baroness Slane by marriage Baroness Slane. Archbishop Thomas Fleming 13th Baron Slane (age 72) had renounced the title before his death but it isn't clear when.