Question

[Chorus:] From forth the fatal loins of these two foes A pair of star-cross'd lovers take their life —Romeo and Juliet,

Answer 1

To introduce the characters

Answer 2

Those lines belong to the prologue of the play "Romeo and Juliet". The purpose of those lines is to introduce the play. It explains the following events, the fact that two young children from enemy families fall in love and end up committing suicide. Thus, the prologue tells the audience exactly what is going to happen.