Syncretism () is the combining of different beliefs, while blending practices of various schools of thought. Syncretism involves the merging or assimilation of several originally discrete traditions, especially in the theology and mythology of religion, thus asserting an underlying unity and allowing for an inclusive approach to other faiths. Syncretism also occurs commonly in expressions of arts and culture, (known as eclecticism) as well as politics (syncretic politics). 

The English word is first attested in the early 17th century, from Modern Latin "syncretismus", drawing on Greek ("synkretismos"), meaning "Cretan federation". 

The Greek word occurs in Plutarch's (1st century AD) essay on "Fraternal Love" in his "Moralia" (2.490b). He cites the example of the Cretans, who compromised and reconciled their differences and came together in alliance when faced with external dangers. "And that is their so-called "Syncretism" [Union of Cretans]". 

Erasmus probably coined the modern usage of the Latin word in his "Adagia" ("Adages"), published in the winter of 1517–1518, to designate the coherence of dissenters in spite of their differences in theological opinions. In a letter to Melanchthon of April 22, 1519, Erasmus specifically adduced the Cretans of Plutarch as an example of his adage "Concord is a mighty rampart". 

Overt syncretism in folk belief may show cultural acceptance of an alien or previous tradition, but the "other" cult may survive or infiltrate without authorized "syncresis" nevertheless. For example, some Conversos developed a sort of cult for martyr-victims of the Spanish Inquisition, thus incorporating elements of Catholicism while resisting it.
What is syncretism?
When was it first attested?
and in Greek?
where does it commonly occur?
anything else?
In English what two languages is it derived from?
In Greek, did it appear in an essay?
What was the name of it?
Did the Cretans compromise?
Did they form an alliance?
When?
Did Erasmus use the word?
In what work?
Was it published?
when?
Who did he write a letter to?
When?
what was it an example of?
What religion was incorporated?
the combining of different beliefs, while blending practices of various schools of thought
Syncretism () is the combining of different beliefs, while blending practices of various schools of thought
the early 17th century,
 is first attested in the early 17th century,
1st century AD
 in Plutarch's (1st century AD)
in expressions of arts and culture,
occurs commonly in expressions of arts and culture,
as well as politics
as well as politics
Modern Latin and Greek
 Modern Latin "syncretismus", drawing on Greek
yes
The Greek word occurs in Plutarch's (1st century AD) essay
an essay on "Fraternal Love" in his "Moralia Untitled though
essay on "Fraternal Love" in his "Moralia
yes
who compromised and reconciled their differences and came together in alliance
yes
and came together in alliance
when faced with external dangers.
when faced with external dangers.
yes
Erasmus probably coined the modern usage of the Latin word 
Adagia
the Latin word in his "Adagia
yes
 published in the winter of 1517–1518
the winter of 1517–1518,
 published in the winter of 1517–1518,
Melanchthon
 In a letter to Melanchthon
April 22, 1519
Melanchthon of April 22, 1519
the adage "Concord is a mighty rampart"
an example of his adage "Concord is a mighty rampart"
elements of Catholicism but I think the definition would be combining any part of belief systems
ncorporating elements of Catholicism