And thank you for your post ... doesn't seem to help us with the reasons for the seating order though ... I was hoping it was in length of reign , but from your research ... it's not!
It's pretty hard to find proper pictures of the foreign royals inside the Abbey, but I have managed to puzzle together a list. It's actually quite OK with regards to the length of their reigns.
First row:
- Sultan of Brunei (1967) with his son
- King of Sweden (1973) with his daughter
Second row:
- King of Leshoto (1996) with wife
- Hereditary Prince and Regent of Liechtenstein (regent from 2004, his father reginig from 1989) with wife
- King of Eswatnini (1986) with wife
Third row:
- Grand Duke of Luxembourg (2000) with his wife
- King of Bahrain (2002) with Crown Prince
- King of Jordan (1999) with his wife
Fourth row:
- King of Tonga (2012) with his wife
- King of Bhutan (2006) with his wife
- Prince of Monaco (2005) with his wife
Fifth row:
- King of the Belgians (2013) with his wife
- Emir of Qatar (2013) with wife
- King of the Netherlands (2013) with his wife
Sixth row:
- King of Malaysia (2019) with wife
- King of Thailand (2016) with wife
- King of Spain (2014) with wife
Seventh row:
- Former Queen of the Hellens with Crown Prince and Crown Princess
- Former King of the Bulgarians with wife
8th row:
- Crown Prince of Serbia with wife
- Princess Margarita of Romania with husband 9th row and behind:
- Various other royal representatives, with heirs in the front row(s)
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