1557: Turkic Consonant Development Mar 19, 2019

In the series on Grimm's Law, it was discussed how there was a progression of certain consonants over time in Germanic languages, such as from [b] → [p] → [f], but this pattern is by no means a given. In Proto Turkic for instance, the [b] at the beginning of verbs would often become an [h] in modern Turkic languages. This is because these Turkic consonants are often contrasted between weakly articulated ones, called lenis consonants, and more strongly, clearly articulated ones, called fortis consonants. 
For more on Grimm's Law, see here: https://stonewordfacts.blogspot.com/searc