Maternal ancestry of Jayne, Lady Porchester?

[Shinjinee]

This lady, daughter of Kenneth Wilby and Princess Prospero Colonna
(nee Frances Loftus), is the mother of Lord Carnarvon's elder son and
heir George, Lord Porchester.

I have found two bits of information on her mother. Is she related by
any chance to the Marquesses of Ely, and what is the Willoughby
connection?


Information

http://pages.prodigy.net/ptheroff/gotha/colonna.html

2e) Prospero, Pr di Stigliano, etc (b.Rome 27 Oct 1938); m.London 26
Apr 1980 Frances Loftus (b.Rychil, Ireland 5 Jun 1939)

1f) Vittoria (b.Dublin 28 Mar 1981)

2f) Lucrezia (b.Dublin 11 Dec 1984)


http://www.ireland.com/newspaper/property/2006/0420/1142365537012.html

Princess to sell Clonmannon and 185 acres


Clonmannon, near Rathnew, Co Wicklow: late 17th century

Co Wicklow/€5.6million: Princess Colonna has reigned over Clonmannon
in Co Wicklow since she bought it from the Chester Beatty estate in
1969. Now she's selling up . . .almost. Property Editor Orna Mulcahy
reports

One of the oldest inhabited houses in Ireland, Clonmannon, near
Rathnew in Co Wicklow, is to be auctioned next month with 185 acres
that includes a lake and right of way to the seashore.

The late 17th century redbrick house which the Knight of Glin
described as "having a touch of doll's house Palladian", is the
property of Princess Frances Colonna di Stigliano, a dashing
sixtysomething blonde who, with a previous husband, bought Clonmannon
from the Chester Beatty estate in 1968 for £150,000.

[Was this Kenneth Wilby?]

It was considered a fortune at the time but Clonmannon had 580 acres
running down to the sea, and a beautiful Georgian house which early
owners, the Truell family, had built in the 1790s when the original
redbrick house became too small for them.

The estate has dwindled since then, the princess having sold off so
many parcels of land that she jokes that she could have opened an
estate agency. Clonmannon House itself was sold off in 1983, its
grounds converted to a retirement village which failed acrimoniously,
and has since been sold on twice.

By the early 1980s, Frances Willoughby had married a Florentine
prince, Prospero Colonna, and restored the original house from near
ruin and it is that house that is now for sale. The couple, who plan
to retire to Monte Carlo, are selling most of the land, but still some
is being held back: the princess intends to keep a stable block, about
20 acres of woodland, and the avenue which runs through the demesne.

[snip - note they are now socialites]

From the hall, a wide staircase leads to the first landing where there
is a delightful sittingroom with twin wing back armchairs framing the
fireplace. Off this level is the first of the bedrooms - a large guest
room - and a pretty panelled bathroom. The small dressing area is home
to the Norman Hartnell wedding dress the princess wore for her first
marriage.

[snip]

Which marriage was this? To Wilby, or to Willoughby?


Thanks, Shinjinee