I do not know how many of you noticed it, but it was quite impressive that no monarch of any European Union member-country or his/her consort attended the wedding except for Queen Margrethe [a sovereign monarch in her own rights] and Queen Sofia [consort of the sovereign monarch of Spain], who both happen to be immediate blood relatives of the groom, his aunts - sister of his mother and sister of his father, respectively.
Moreover, it is quite remarkable that despite the closeness between King Constantine and the British royal family, the representation was very "thin" with just a junior member of the royal family attending - prince Michael of Kent. The absence in toto of the Belgian and the Luxembourg families were also very "vocal".
Thus, it is absolutely clear that, in view of Greece's major fiscal problems and/or in deference to the Republic of Greece, the EU Central Government had probably advised member states with monarchies to keep a low profile.
This attitude was quite comforting to, and deeply appreciated by, the Greek people who are currently struggling and needing a lot of support from the EU.