This posting is sent with the hope that it will taken as constructive and not destructive comments.
MI is the standard abbreviation for Monumental Inscription [tombstone].
I see that all the 141 instances of 'information' are from trees submitted to a web site. In my opinion they have probably all been copied on from information on the web and some on the LDS web site. Unfortunately this usually means that no research has been carried out to ascertain whether the information has any basis of truth.
Parish registers are the most reliable source and this is what is in Heacham parish register [this is as accurate as the person who wrote it at the time- and they are not infallible] HEACHAM PR 27 May 1560 Eustace Rolfe married Joan Jenner.As was normal at this time there is no indication as to their ages or their parentage. 21.6. 1593 burial of Eustace Rolfe- His MI says he was 77 year [this is often incorrect- but assuming it to be close then he was born in 1516] There will be no record of his birth as parish registers did not commence until 1537. Joan's death is not known except that she died before Eustace. She may have died around 1563 giving birth to their son John as he was an only child.
John Rolfe was baptised at Heacham 13 Oct 1562, and he married Dorothy Mason there 26 July 1582. [Again - no other details are given- no parents] Her birth is not recorded in the Heacham register so it can be assumed she came from elsewhere She died the 17th Oct 1645 and was buried the 26th October. Her MI gives her age as 'in her 80th year' which would make her birth around 1565.She married her second husband Robert Redmaine 9.3.1593/4 in Heacham.
I would treat with extreme caution the information you found from the web site- quote-JENNER, JOANNA M. Eustace Rolfe- she born 1539. Her father John Jenner b. 1516 from Heacham, Norfolk, England. m. Agnes Russel .His father was William Gayner d.1568/1569 Of the other 141 listings, a few show that William Mason b. 1615, [is this a typo?] married Agnes Brown Rolfe, b. 1540 m. 1562, d.1596unquote.
How can John Jenner's father be William Gayner? I find no trace of a William Mason marrying an Agnes Brown. Any other information on the web should be verified by checking back to the original source material
Hope this helps clear up a few of the spurious dates and prevents them being copied on and on- Joyce