was murdered by the court physician Rakrian Tanca, one of Rakrian Kuti's aides. Another version suggested that Jayanagara was assassinated by Gajah Mada in 1328. Jayanagara was overly protective of his two half sisters, born from Kertarajasa's youngest queen, Dyah Dewi Gayatri. Complaints by the two young princesses led to the intervention of Gajah Mada. His solution was to arrange for a surgeon to murder the king while pretending to perform a surgery. Jayanegara was immediately succeeded by his half-sister Tribhuwana Wijayatunggadewi (ruled 1328–1350). However, when she took the reign Sedeng and Keta did not send their delegations which was interpreted as rebellion. This was confirmed later after spies sent by her, both regions were preparing for rebellions. Sadeng and Keta were coastal regions and formerly conquered by Majapahit. However the death of Nambi in 1316, a Majapahit patih, who was deemed instrumental in raising both regions also contributed to the rebellion, at this time Sadeng was also led by a famed Majapahit general, Wirota Wiraganti. Gajah Mada currently patih, was sent by Tribhuwana with the advice of the sickly mahapatih Arya Tadah, to negotiate with rebel leaders in 1331. However Majapahit general and Gajah Mada rival, Ra Kembar preceded his arrival with his army to crush both rebellions, his men Jabung Tarewes, Lembu Peteng, dan Ikal-Ikalan Bang were also the ones implicated in the murder of Nambi. This led to conflict between Gajah Mada and Ra Kembar forces which was only solved when Tribhuwana Wijayatunggadewi herself lead the battles against both rebelling regions. After Arya Tadah retirement, Gajah Mada would be picked as Mahapatih in 1334. It was during Gajah Mada's reign as mahapatih, around the year 1345, that the famous Muslim traveller, Ibn Battuta visited Sumatera. Palapa oath and empire expansion It is said that it was during his appointment as mahapatih under queen Tribhuwanatunggadewi that Gajah Mada took his famous oath, the Palapa Oath or Sumpah Palapa. The telling of the oath is described in the Pararaton (Book of Kings), an account on Javanese history that dates from the 15th or 16th century: “Sira Gajah Mada pepatih amungkubumi tan ayun amukita palapa, sira Gajah Mada : Lamun huwus kalah nusantara Ingsun amukti palapa, lamun kalah ring Gurun, ring Seram, Tanjungpura, ring Haru, ring Pahang, Dompo, ring Bali, Sunda, Palembang, Temasek, samana ingsun amukti palapa “ "Gajah Mada, the prime minister, said he will not taste any spice.