My aristocratic friend

Question

I once had a friend. Every second year he wrote me a letter, hoping to receive acknowlodgements for his achievements and developments on behalf of all of human kind.

He was born at an Imperial hospital.

He had three friends. One of them founded Red Cross half-life. Peter and Mary was curious about life.

Once he travelled with another friend to Africa, to commemorate the church founder, singing Hallelujah without 'o'!

Einstein's forefather plays golf.

My friend's favourite object was a brown radio.

In what city did he meet his emperor again?

Hint:

My friend's birthday is in the 111th period.

Answer 1

I think that I now understand most of the puzzle.
I would guess that the answer to "In what city did he meet his emperor again?" should be

Vienna (= Wien).

---

Explanation:

The main theme are

Nobel prize winners of physics in odd-numbered years, starting from the year 1901;
this is indicated by "Every second year he wrote me a letter";
The puzzle covers 1901, 1903, 1905, 1907, 1909; hence the answer should fall into the year 1911.

He was born at an Imperial hospital.

Wilhelm Conrad Röntgen; Nobel prize for physics 1901
Imperial=Wilhelm (Emperor Wilhelm II); hospital=Röntgen (X-rays)

He had three friends. One of them founded Red Cross half-life. Peter and Mary was curious about life.

Henri Bequerel, Pierre Curie, Marie Curie; Nobel prize for physics 1903
Red Cross = Henri (Henri Dunant); half-life = Bequerel;
Peter=Pierre; Mary=Marie; curious=Curie

Once he travelled with another friend to Africa, to commemorate the church founder, singing Hallelujah without 'o'!

Philipp Lenard; Nobel prize for physics 1905
The Apostle Philip is regarded as the founder of the African church.
Leonard Cohen sang "Hallelujah"; Leonard without 'o' = Lenard

Einstein's forefather plays golf.

Albert Abraham Michelson; Nobel prize for physics 1907
Einstein=Albert; forefather=Abraham; golf=Phil Mickelson

My friend's favourite object was a brown radio.

Karl Ferdinand Braun (brown); Nobel prize for physics 1909
Guglielmo Marconi (radio); Nobel prize for physics 1909

In what city did he meet his emperor again?

Wilhelm Wien, Nobel prize for physics 1911
German physicist; the first name Wilhelm is the name of the German emperor Wilhelm II, the family name Wien is the German name of the city Vienna.

My friend's birthday is in the 111th period

Wilhelm Conrad Röntgen; Nobel prize for physics 1901
The chemical element with number 111 is Roentgenium, called after Wilhelm Röntgen.

Answer 2

Partial answer:

This appears to relate to

Nobel prize winners.

---

* Though the sentences appear to be muddled, there is reference to Peter and Mary (better know as Pierre and Marie Curie) who researched radioactive elements - hence the reference to half-life - and won the prize for Chemistry.
* Einstein won the Nobel Prize for Physics.
* Also mentioned is the founder of the Red Cross, Jean Henri Dunant, who was travelling to Solferino to meet Emperor Napoleon III when he witnessed the battle scene that inspired him to set up the organisation, leading to his Nobel Peace Prize.
* Albert Schweitzer received the 1952 Nobel Peace Prize. Founded and sustained the Albert Schweitzer Hospital in Lambaréné (now in Gabon). As organist, he influenced the Organ reform movement.