So where did Ratnasambhava and Amoghasiddhi come from? This is something of a mystery. The standard texts such as Snellgrove's Indo-Tibetan Buddhism note the appearance of the pair, describe them and then move on. There is nothing about the process, nor about why they make a pair. Do they make a pair? Ratnasambhava is in the south, is golden yellow, is lotus throne is supported by horses, his mudra is the varada or giving mudra, and his emblem is the jewel - his name means Jewel Born. He is associated with the sun at midday. Ratnasmabhava's wisdom is the wisdom of equality which sees the that everything has the same nature, which is the nature of Shunyata.
Amoghasiddhi is in the north, is dark green, and his lotus throne is supported by shang-shang birds (these are garuda birds with human torsos and heads who play cymbals.) His mudra is the mudra of fearlessness and his emblem is the crossed vajra. In Sanskrit it is vishva-vajra, where vishva means something like "on all sides". Amoghasiddhi's wisdom is the wisdom of fearlessness. The Buddha kula that he presides over is known as the action family and his name means Unobstructed Success.
The breakthrough in understanding this pair came while attending a communication course with Locana. Over simplifying a bit, the model of communication and connection that Locana was describing begins with observation. Feelings arise from these observations. These feelings connect us with, and flag up, our values or needs. And out of this we move into action, or we make a request. The details are not important, but what struck me was that three of the steps in the model - observation, feelings, and actions - could relate to three of the Buddhas in the mandala. Obervation is intellect, but also brings to mind the mirrorlike wisdom which sees things just as they are. Feelings are obviously connected with red Amitabha's compassion. Action as I just mentioned were the concern of Amoghasiddhi. What was left out was values. The values, or sometimes needs, that are referred to are universal human values that we can all understand and connect with. They are the key to understanding conflict and connection. And it struck me that values is what Ratnasambhava corresponds to.
The jewel that Ratnasambhava holds is the cintamani, a symbol for the Bodhicitta. This is surely the highest value of Buddhists. We value Awakening as the most value thing. Generosity is the most fundamental virtue in Buddhism, which is to say that we value it highly. Generosity is sometimes seen as the best practice for lay people, whereas Awakening is the goal of serious practitioners. Generosity builds us merit which will a lay person to be born in fortunate circumstances, i.e. in circumstances where they can practice seriously and Awaken. In a mundane sense Ratnasambhava represents wealth. One of the main Bodhisattvas of his kula is Jambhala who holds a mongoose which spews forth jewels when squeezed. So yes, this does seem to fit. Sangharakshita has associated Ratnasmabhava with beauty and art. I think this is covered by the idea of value. Beauty is the object of aesthetic appreciation, and paying attention to beauty, according to Sangharakshita, helps to refine our senses. Refining our senses can help us to make progress towards experiencing more refined states of mind. Finally great art can help to transform our lives by inducing in us a reflection of the inspired state of the artist.
I suspect that Amoghasiddhi came first however. In the early tantra there were three Buddha kulas. At around the same time a group of three Bodhisattvas appeared in Buddhist art. Avalokiteshvara, Manjusri and Vajrapani represented compassion, wisdom and energy. The word translated as energy is virya. Virya is energy in pursuit of the good, ethical energy. It is energy directed towards Awakening. Amoghasiddhi is the Buddha of action, and this action is motivated by, and directed towards, the good. And the good is represented by the jewel held by Ratnasmabhava. So yes Ratnasambhava and Amoghasiddhi do represent a pair.
Another observation has occurred to me in the last few days. Ratnasmabhava is a solar deity, he is associated with horses, is associated with giving, and is associated with art, beauty, and inspiration. Now there is another Indian deity who shares these characteristics and that is Agni. Agni is one of the old Vedic gods whose worship is outlined in the Rigveda. The word agni is cognate with ignite, and he was associated with the sacrificial fire, but also anything which burned including digestion, and the sun! So Agni is synonymous with the sun. The largest and most elaborate sacrifice in the Vedic calendar was the horse sacrifice - which is described in the first book in the Rigveda. Finally it was through possession by Agni that the Vedic sages were able to give voice to the ecstatic inspired hymns which make up the Rigveda. He is the source, the spark, of imagination and poetry - the highest art of the Vedic period.
This kind of absorption, if I am right, should come as no surprise. This is what the history of Indian religion is like. Buddhism adopted and absorbed deities from the earliest times, so that Indra is a frequent character in the Pali Canon for instance. The five Buddha mandala is a feature of esoteric Buddhism, which is itself a grand synthesis of seventh century Indian religion.
image by Aloka from the Padmaloka website.