The Mystery of the Misses Bonnynge

Last October, while I was in Dublin, I took a trip to Glasnevin Cemetery on the northside of the city to visit some family graves.  My great-great-great grandparents, Laurence and Bridget (Treston) O'Reilly, are buried there as are four of their children and two of their grandchildren.  While those plots are unmarked, as many in the cemetery are, I did find a marker on another plot that raised some questions.

In the area of the old chapel (since demolished), the section of graves are still called the Chapel Circle.  My great-great-great grandfather's predecessor at Mount Albion House in Dundrum, James O'Reilly, and his brother, Dr. Laurence O'Reilly, as well as a presumed sister of theirs, Bridget, are all buried in the Chapel Circle section.  Now, I still haven't determined the precise relationship between these O'Reillys to mine, but my working theory is that James and Dr. Laurence are most likely uncles of my Laurence.  The surprise here is that the grave was marked after all (a previous attempt my parents made on an earlier trip had not found the correct location, it turned out), and not only that, the O'Reillys weren't alone.  The marker on the grave reads:

Photo © the author, 2016

Erected in memory of the
MISSES BONNYNGE.
By DOCTOR O'REILLY - Ratoath.
In life respected
In death regretted.
May they rest in peace amen.
J. Farrell F^t 1841

I knew this was the right O'Reilly, because he was a doctor and did live in Ratoath, but the Bonnynge name was wholly unfamiliar to me.  So who were they?  How were they connected to the O'Reillys?  Once I'd arrived back in the States, I emailed the cemetery's office and received confirmation that the O'Reilly plot and the Bonnynge plot were, in fact, one and the same.  I've also since uncovered some more information that superficially answers one of my initial questions - who they were.  That's an entire post in itself, though, so it will have to wait.

Additional historical note: the bottom left of the inscription is the mason's signature.  The "Ft" is probably an abbreviation of the Latin "fecit" - literally "J. Farrell made it".  To this day, the company of Farrell & Son continues to make headstones and monuments just down the road from the cemetery.  The Irish Times published an article on the history of the company back in 2008.