India, June 20 -- As Shiv Sena marks 60 years since its founding by Bal Thackeray on June 19, 1966, the party is facing yet another rebellion.

Just four years after Eknath Shinde's revolt split the party and wrested control of its name and symbol, now, six of Shiv Sena (UBT) chief Uddhav Thackeray's nine Lok Sabha MPs are likely to call it quits, to align with the Shinde-led faction.

The latest turmoil is the newest chapter in a six-decade political journey that saw Shiv Sena evolve from a Mumbai-centric regional movement into one of Maharashtra's most influential political forces, while also witnessing multiple splits, leadership transitions and shifting alliances.

June 19, 1966: Bal Thackeray founded Shiv Sena. A year later, the part...