Suffocation in ash
Suffocation in ash is a form of capital punishment, following the general principle of asphyxiation (rather than, say, the shedding of blood), in which the individual is suffocated by being in some way immersed into ash. As an execution practice, it is attested from ancient Persia and within a certain Meso-American culture.
In ancient Persia, there existed an execution method where a tower/room was filled with ash, into which the condemned person was plunged. Wheels were constantly turned while he was alive, making the ash whirl about, and the person died by gradual suffocation as he inhaled the ash. The description can be found in Valerius Maximus and 2 Maccabees 13:5-8.
Reputedly, the first to suffer this punishment was Sogdianus. He killed his half-brother Xerxes II around 423 BC. Another half-brother, Ochus (later called Darius II) rebelled against him, and killed Sogdianus in this manner because he had promised Sogdianus he would not die by the sword, by poison or by hunger. At the instigation of his wife Parysatis, Darius II had yet another half-brother, Arsites, executed in the same manner for rebellion, along with Arsites' general Artyphius. Some time later, a rebelling general Pisuthnes met the same fate.
Nezahualcoyotl, a 15th-century, pre-Columbian, non-Aztec Acolhuan ruler of Texcoco in modern Mexico, designed a law code that is partially preserved. Those who had engaged in the active role of homosexual anal intercourse were suffocated in a heap of ash. Their passive partners had their intestines pulled out, then their bodies were filled with ash, and finally, were burnt. 
- Rollin, C.:"The ancient history of the Egyptians, Carthaginians, Assyrians ..., Volume 3, London 1735, p.396-98"
- For Maccabee description, see: George D'Oyly and Richard Mant: "The Holy Bible: With Notes, Explanatory and Practical... Together ..., Volum 2" Oxford 1818, page xcvii and xvii
- Kitto, J. "Palestine: the Bible History of the holy land" London 1841, p.657
- Täubel, Gottlob (1796). Allgemeines Historienbuch von den Merkwurdigsten Entdeckungen fremder ehedem ganz unbekannter Länder und Inseln. Vienna: Gottlob Täubel. pp. 206–07. Retrieved 2014-01-22.