He took office on 22 August 1991 , becoming the 12th Prime Minister of Tonga since 1876 .
Vaea 's predecessor , Fatafehi Tu'ipelehake had resigned from office in 1991 due to declining health .
Vaea took office on 22 August 1991 , becoming the 12th Prime Minister of Tonga since 1876 .
Vaea 's predecessor , Fatafehi Tu'ipelehake had resigned from office in 1991 due to declining health .