I will discuss joint work with Gaetan Chenevier in which we exploit the triality automorphism of D4 to construct new cases of Langlands functoriaity, such as the Spin lifting from GSp(6) to GL(8), the Rankin-Selberg lifting of symplectic type cuspidalrepresentaitons of GL(4) x GL(2) to GL(8) and the adjoint lifting of GL(3). If time permits, some appications of the Spin lifting may also be discussed, such as a weak LLC for PGSp(6) (joint with G. Savin) and the charcaterization of the image of functorial lifting of globally generic cuspidal representations of G2 to GL(7) (joit with E. Lapid).