col : # | name | birth and death | office started | office ended row 1 : 1 | geir vidalin | 27 october 1761 - 20 september 1823 | 1801 | 1823 row 2 : 2 | steingrimur jonsson | nan | 1824 | 1845 row 3 : 3 | helgi thordersen | 8 april 1794 - 4 december 1867 | 1846 | 1866 row 4 : 4 | 'petur petursson | 3 october 1808 - 15 may 1891 | 1866 | 1889 row 5 : 5 | hallgrimur sveinsson | 5 april 1841 - 16 december 1909 | 1889 | 1908 row 6 : 6 | thorhallur bjarnarson | 2 december 1855 - 15 december 1916 | 1908 | 1916 row 7 : 7 | jon helgason | 1866 - 1942 | 1917 | 1939 row 8 : 8 | sigurgeir sigurdsson | 3 august 1890 - 13 october 1953 | 1939 | 1953 row 9 : 9 | asmundur gudmundsson | 6 october 1888 reykholt - 29 may 1969 re | 1954 | 1989 row 10 : 10 | sigurbjorn einarsson | 30 june 1911 vestur-skaftafellss | 1959 | 1981 row 11 : 11 | petur sigurgeirsson (son of sigurgeir | 2 june 1919 - 3 june 2010 | 1981 | 1989 row 12 : 12 | olafur skulason | 29 december 1929 - 9 june 2008 | 1989 | 1997 row 13 : 13 | karl sigurbjornsson (son of sigurbjorn ein | 5 february 1947 reykjavik | 1998 | 2012 row 14 : 14 | agnes sigurdardottir | 19 october 1954 isafjordur | 24 june 2012 | incumbent
who are all the bishops who served? which of these started in 1846 or after? which of these finished in 1866 or before?
helgi thordersen
# Name Birth and death Office started Office ended
which of these finished in 1866 or before?
1 Geir Vidalin 27 October 1761 - 20 September 1823 1801 1823
2 Steingrimur Jonsson nan 1824 1845
3 Helgi Thordersen 8 April 1794 - 4 December 1867 1846 1866
4 'Petur Petursson 3 October 1808 - 15 May 1891 1866 1889
5 Hallgrimur Sveinsson 5 April 1841 - 16 December 1909 1889 1908
6 Thorhallur Bjarnarson 2 December 1855 - 15 December 1916 1908 1916
7 Jon Helgason 1866 - 1942 1917 1939
8 Sigurgeir Sigurdsson 3 August 1890 - 13 October 1953 1939 1953
9 Asmundur Gudmundsson 6 October 1888 Reykholt - 29 May 1969 Re 1954 1989
10 Sigurbjorn Einarsson 30 June 1911 Vestur-Skaftafellss 1959 1981
11 Petur Sigurgeirsson (son of Sigurgeir 2 June 1919 - 3 June 2010 1981 1989
12 Olafur Skulason 29 December 1929 - 9 June 2008 1989 1997
13 Karl Sigurbjornsson (son of Sigurbjorn Ein 5 February 1947 Reykjavik 1998 2012
14 Agnes Sigurdardottir 19 October 1954 Isafjordur 24 June 2012 Incumbent
Helgi Thordersen
which of these finished in 1866 or before? || which of these started in 1846 or after? | who are all the bishops who served?