In what era did the development of polyphony begin to emerge

Polyphony is defined as the style of simultaneously combining a number of parts, each forming an individual melody and harmonizing with each other.

The development of polyphony began to emerge in the Romanesque era. The earliest type of polyphony was organum or the earliest harmonization of the chant.

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the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.