Vasubandhu

The figure named as the twenty-first Chan patriarch presents a famously difficult identification problem^[1]. The Sanskrit name Vasubandhu in Indian Buddhist history attaches most prominently to the great Yogācāra philosopher of the fourth–fifth century CE, brother and disciple of Asaṅga, author of the *Abhidharmakośa*, the *Triṃśikā* (Thirty Verses), the *Viṃśatikā* (Twenty Verses), and the foundational treatises of the Yogācāra ("Mind-Only") school^[2]. The Chan tradition's twenty-first patriarch, however, is dated to a period earlier than the Yogācāra Vasubandhu and described as the disciple of Jayata and teacher of Manorhita, suggesting a different—or, more likely, composite—figure.

The historical Vasubandhu, on the chronology proposed by Erich Frauwallner and now widely discussed in scholarship, may in fact be two distinct figures of the same name conflated by the later tradition: a fourth-century Vasubandhu, brother of Asaṅga and author of the Yogācāra trilogy, and a fifth-century Vasubandhu who composed the *Abhidharmakośa*^[3]. Whether the Chan patriarch corresponds to either of these or to a still earlier teacher cannot be determined from the surviving sources.

What is certain is that the historical Vasubandhu's *vijñaptimātratā* ("nothing-but-cognition") doctrine had a profound effect on Chinese Mahāyāna and indirectly on Chan. The *Triṃśikā* analyzes consciousness into the *ālayavijñāna* (storehouse consciousness), the *manas* (afflicted mind), and the six sense-consciousnesses, and proposes that all phenomena are transformations of consciousness^[4]. This analysis entered Chinese Buddhism through Paramārtha (6th c.) and Xuánzàng's Faxiang school (7th c.), and forms part of the philosophical background against which Chan defines its own position—at times appropriating Yogācāra categories (the *ālayavijñāna* as an analogue of original mind), at times rejecting Yogācāra's analytical mode in favor of direct pointing^[5].

In the *Jǐngdé Chuándēng Lù*, the twenty-first patriarch is described in stock hagiographical terms as the converter of an army of disputants in northwestern India and the recognizer of his successor Manorhita^[6]. Dumoulin notes that the placement of a "Vasubandhu" in the lineage gives the Chan transmission a connection to the prestigious Yogācāra philosophical tradition without committing the compilers to specific historical claims^[7].