Located at the eastern end of the western section of the Yungang Grottoes, the Five Caves, constructed under the supervision of Tan Yao ( Caves No. 16-20), were commissioned by Emperor Wencheng of the Northern Wei Dynasty and overseen by the eminent monk Tan Yao from Liangzhou. These five majestic caves exhibit a unique sculptural style, blending Gandharan1 and Mathuran2 influences from Western Regions with distinct elements of the Xianbei ethnicity. 

1. 犍陀罗：南亚古国名。

   Gandhara: An ancient kingdom in South Asia.

    

2. 秣菟罗：玄奘《大唐西域记》卷四中记载的印度古代国家。

   Mathura: An ancient Indian kingdom recorded in Volume 4 of Xuanzang’s Great Tang Records on the Western Regions (Datang Xiyu Ji).

The colossal statues in these caves are widely believed to represent the five emperors of the early Northern Wei Dynasty. In caves No. 18-20, the main Buddha figures wear monastic robes with the right shoulder exposed, exuding solemn grandeur, while the standing attendant figures on both sides wear full–shoulder robes, radiating serene elegance. Both garment styles, expertly depicted in these caves, are defining characteristics of Gandharan and Mathuran Buddhist art. 

Upon entering Cave No. 18, on both sides of the main statue one can clearly see the solemn figures of Buddha’s ten great disciples. On closer observation of the left side, there is a disciple holding the Buddist robe. Near its elbow, a carving depicting only a head, slightly turned toward the Buddha. This figure represents the Buddha’s foremost disciple, Kāśyapa. This figure has a high nose and deep-set eyes, exhibiting distinct Western facial features. Similarly, the wavy uṣṇīṣa atop the head of the main statue in Cave No. 16 is a clear manifestation of the Gandharan style. Notably, the robe worn by the main statue in Cave No. 18 clings closely to the body—a thin, silhouette-revealing style that is characteristic of the Mathuran style of art. 

The caves located in the eastern section of the Yungang Grottoes—caves No. 1-2, and No. 3—as well as those in the central section—caves No. 5-6, 7-8, 9-10, and 11, 12, 13—all belong to the Middle Grottoes, excavated during the reign of Emperor Xiaowen and Empress Dowager Feng, after Emperor Wencheng and before Emperor Xiaowen moved the capital to Luoyang. 

The Middle Grottoes display a rich diversity of architectural forms, encompassing the three main types found in the Yungang Grottoes: giant statue caves, Buddha hall caves, and central pillar caves. Additionally, the“twin caves”—adjacent cave temples with nearly identical forms, closely connected in layout and sculptural content—are particularly noteworthy. While retaining the Western Regions’influences of the early period, the sculptures skillfully incorporate distinctive ethnic elements, showcasing unique artistic charm. 

Western influences can still be observed in the statues from this period. For instance, in caves No. 7-8, the main statues still wear robes in the earlier style, leaving the right shoulder exposed. Corinthian capitals in the Greco–Roman style are also present. In the front chambers of caves No. 9-10, both Ionian and Corinthian capitals of Greek and Roman design are visible. One can even spot yaksha figures on the ceiling of the front chamber that resemble Western–style angels. The Vajra warriors flanking the entrance to Cave No. 9 hold tridents, a design previously seen on coins from the Persian Sasanian Empire. The guardian deities on both sides of the entrance to Cave No. 8, as well as the Vajra warrior with a goat–like mustache on the western wall of the central pillar in Cave No. 6, exhibit clear Central and Western Asian sculptural elements. 

Ethnic integration became increasingly prominent during this period. In caves No. 5 and No. 6, the attire of the Buddha statues underwent a significant transformation: from the earlier Western–style robes to one that features broad sleeves, low–hanging collars and wide sashes tied at the chest ( known as the baoyi-bodai style). This shift reflects Emperor Xiaowen’s efforts to promote sinicization reforms and vividly illustrates the cultural interaction and exchange between the Xianbei and Han peoples. 

The Late Grottoes include Cave No. 4 in the eastern section, caves No. 14, No. 15, and No. 21–45 in the western section, as well as subsidiary caves surrounding the main caves. Most of these caves were excavated by local patrons in the Pingcheng area after the Northern Wei capital was relocated to Luoyang. Following Emperor Xiaowen’s sinicization reforms, the Buddhist statues of this period all wear the baoyi-bodai style robes, featuring xiugu-qingxiang ( slender figures with refined elegance ) , fully embodying the distinct characteristics of Han influence. 

Two key figures played pivotal roles in the excavation of the Yungang Grottoes. 

During the Wei, Jin, and Northern-Southern dynasties ( 220—589 AD ) , Buddhism flourished in the Hexi Corridor. A large number of monks and artisans from the Western Regions either settled in the area or passed through it on their way to the Central Plains. Liangzhou ( present-day Wuwei in Gansu), one of the four prefectures of the Hexi Corridor, became a hub for them. It was also here that the Tiantishan Grottoes were constructed during the Northern Liang period. 

In 439 AD, Northern Wei Emperor Taiwu ( Tuoba Tao ) conquered Northern Liang, capturing its capital Liangzhou and relocating local monks and artisans—including Tan Yao—to the Northern Wei capital, Pingcheng. 

In 460 AD, Tan Yao directed the excavation of Yungang Grottoes, employing primarily Liangzhou artisans. The Book of Wei records that in 455 AD, a monk from the Western Regions arrived in Pingcheng with Buddhist iconographic manuscripts. These texts, along with monks and artisans from the Western Regions, were essential for the Western artistic influences visible in the Early Grottoes. 

Following the death of Emperor Wencheng, Empress Dowager Feng assumed the regency, facilitating the smooth implementation of Emperor Xiaowen’s reform policies. In 468 AD ( the tenth year of the Taihe period ) , Emperor Xiaowen introduced clothing reforms mandating Han-style attire. In alignment with this policy, the Buddha statues in Yungang Grottoes adopted Han-style robes, most notably the baoyi-bodai style prominently featured in caves No. 5 and No. 6. Furthermore, during the excavation of the Middle Grottoes, the Northern Wei court recruited artisans from Xuzhou in eastern China, leading to Buddha statues that exhibit clear characteristics of this ethnic and cultural integration. 

The conservation of the Yungang Grottoes began immediately after their completion during the Northern Wei Dynasty. Subsequent dynasties primarily employed painted clay modeling with layered applique to preserve the Buddha statues. In the early Jin period, Wanyan Zonghan, the military governor stationed at Xijing ( present-day Datong ) , observed that the Wuzhou River’s proximity to the grottoes posed an erosion risk and consequently diverted its course. 

During the period of the Republic of China, Zhao Chengshou, a Jin army general stationed in Yungang, led his troops in daily dawn patrols to drive away looters, repair statues, clear debris, and organize scattered fragments of relics. His dedication ensured the preservation of the Yungang Grottoes even through the years of warfare. After the founding of the People’s Republic of China, the protection of the Yungang Grottoes became increasingly systematic. In 1973, following the visit of French President Georges Pompidou to Yungang accompanied by Premier Zhou Enlai, the site drew significant attention. Authorities soon launched the Three-Year Protection Project, focusing on emergency reinforcements, restoration of nearly collapsed caves, and archaeological work. The subsequent 1991–1995 Protection and Restoration Project marked a significant advancement in conservation efforts. It introduced more scientific approaches, including: a ) lowering the surrounding ground level and improving drainage systems to reduce water damage; b ) installing protective walls to enhance equipment monitoring and ensure visitor safety; c ) constructing wooden cave eaves to shield against coal dust and acid rain; d ) employing multiple reinforcement techniques to mitigate the risk of collapse. With these efforts, the conservation of the Yungang Grottoes has evolved from ad-hoc emergency efforts to a more scientific, systematic, and sustainable approach, laying a solid foundation for their enduring legacy.