I could not find that particular site in question, but I found another site that indicated that there was a first marriage. See # 9
I went to google.com and put in "martha suren" av norge and found the following:
9 [1] Kong Olav V av NORGE Born: 2-Jul-1903 in Appleton House, Sandringham Died: 17-Jan-1991 in Kongsseteren, Oslo
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+Märtha SUREN Married: 1920 Died: 1986
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*2nd Wife of [1] Kong Olav V av NORGE:
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+Prinzessin Märtha av SVERIGE Born: 28-Mar-1901 in Stockholm Married: 21-Mar-1929 in Vor Frelsers Church, Oslo Died: Apr-1954 in Oslo, Norway
from the link:
Family Tree Maker's Genealogy Site: Outline Descendant Tree ...- [ Translate this page ]9 [1] Kong Olav V av NORGE Born: 2-Jul-1903 in Appleton House, Sandringham Died: 17-Jan-1991 in Kongsseteren, Oslo ......................... +Märtha SUREN ...
familytreemaker.genealogy.com/users/g/o/e/Martin-G-Goebel/ODT5-0001.html - 21k - Cached - Similar pages
Family Tree Maker's Genealogy Site: Outline Descendant Tree: Descendants of Alexander von Dohna-Schlobitten