 Vasubandhu’s elder half-brother was Asaṅga, the monk who meditated in solitude for twelve years until he was able to meet with and receive teachings directly from the future Buddha, Maitreya. Asaṅga thereby became the preeminent expounder of the Yogācāra synthesis of “Great Vehicle” (Mahāyāna) Buddhism, writing some texts himself, and transmitting the so-called “Five Treatises” revealed by Maitreya. When he was advanced in years, Asaṅga became worried about his younger brother’s karmic outlook (Vasubandhu had publicly insulted Asaṅga’s works). So he sent his students to teach Vasubandhu and convince him to adopt the Yogācāra system. It worked. This narrative provides a reason for Vasubandhu’s having written many texts from the Yogācāra perspective after his prior advocacy of so-called “Śrāvaka” positions. It explains why the author of the Treasury and its Commentary might have gone on to write several commentaries on Mahāyāna scriptures, a treatise that defends the legitimacy of Mahāyāna scriptures, and a series of concise Yogācāra syntheses.