In what year was the author of Heir to the Empire born?
1951
1939
1939
1932
1923
1926
1927
1931
1924
1939
1932
1922
1923
1926
1921
1927
1931
1924
1939
1932
1922
1923
1912
1926
1921
1927
1931
1924
1908
1939
1958
1932
1922
1950
1923
1926
1953
1921
1963
1927
1907
1931
1955
1924
1952
1958
1950
1953
1960
1939
1963
1932
1922
1923
1954
1912
1957
1926
1921
1927
1955
1952
1958
1962
1950
1931
1959
1953
1924
1960
1951
1963
1954
1948
1946
1957
1908
1907
1939
1932
1922
1923
1955
1926
1952
1958
1962
1947
1927
1950
1959
1953
1960
1951
1949
1956
1963
1931
1954
1948
1946
1912
1957
1964
1961
1924
1921
1955
1908
1952
1939
1958
1962
1947
1932
1950
1923
1959
1926
1953
1960
1951
1949
1956
1965
1963
1927
1954
1948
1946
1957
1964
1937
1961
1907
1913
1922
1931
1955
1902
1952
1958
1962
1947
1950
1959
1970
1953
1936
1960
1951
1949
1939
1956
1965
1938
1963
1932
1923
1954
1948
1946
1912
1957
1964
1926
1937
1961
1924
1921
1904
1927
1967
1909
1955
1952
1958
1962
1947
1966
1950
1959
1943
1970
1953
1936
1968
1960
1951
1949
1956
1965
1938
1963
1954
1948
1946
1940
1957
1964
1937