Twin Quasar
The Twin Quasar ( also known as Twin QSO , Double Quasar , SBS 0957+561 , TXS 0957+561 , Q0957+561 or QSO 0957+561 A/B ) , was discovered in 1979 and was the first identified gravitationally lensed object . 
<triplet> Twin Quasar <subj> 1979 <obj> time of discovery or invention