The diary of a newborn.
The diary of an illiterate 16th century chamber maid.
The diary of a Norman conquistador.
The diary of a martyr.
The diary of an 18th century pub landlord, candle stick maker, baker and so on.
The diary of a 17th century New York landlord.
And then there are the diaries not written by dedicated diarists:
The self-reflective diary of the appointment diarist.
The appointment diary of the allotment diarist.
The nature diary of the fitness app.
And so on.
The stories are without end. And the vast array of life is breathtaking.