SELECT MIN(year) FROM table_14903999_1 WHERE mixed_doubles = "Þorvaldur Ásgeirsson Lovísa Sigurðardóttir"
Apa tahun paling awal Thorvaldur ásgeirsson Lovísa Sigurðardóttir memenangkan ganda campuran
CREATE TABLE table_14903999_1 (year INTEGER, mixed_doubles VARCHAR)