Around 1222 Matilda Angus 6th Countess Angus was born to Maol Choluim Angus 5th Earl Angus (age 32).

In 1242 [her father] Maol Choluim Angus 5th Earl Angus (age 52) died. His daughter Matilda Angus 6th Countess Angus (age 20) succeeded 6th Countess Angus.

In 1245 [her son] Gilbert Umfraville 7th Earl Angus was born to Gilbert Umfraville (age 50) and Matilda Angus 6th Countess Angus (age 23).

Before 12 Dec 1247 Richard de Dover Plantagenet (age 27) and Matilda Angus 6th Countess Angus (age 25) were married. She the daughter of Maol Choluim Angus 5th Earl Angus. They were fourth cousins. He a grandson of King John of England.

In 1261 Matilda Angus 6th Countess Angus (age 39) died. Her son [her son] Gilbert Umfraville 7th Earl Angus (age 16) succeeded 7th Earl Angus.

On 09 Aug 1270 [her former husband] Richard de Dover Plantagenet (age 50) died in Carthage.

Gilbert Umfraville and Matilda Angus 6th Countess Angus were married. The difference in their ages was 27 years. She the daughter of Maol Choluim Angus 5th Earl Angus.

John Comyn Earl Angus and Matilda Angus 6th Countess Angus were married. She the daughter of Maol Choluim Angus 5th Earl Angus. He the son of William Comyn Earl Buchan and Sarah Fitzhugh.

[her daughter] Isabel Plantagenet Countess of Atholl was born to Richard de Dover Plantagenet and Matilda Angus 6th Countess Angus. She a great granddaughter of King John of England.

[her son] Richard Plantagenet was born to Richard de Dover Plantagenet and Matilda Angus 6th Countess Angus. He a great grandson of King John of England.