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It is recognised as one of the eight figures based on pramāṇa (ie
valid knowledge) by Appayya and a few others.
 
When some traditional statement, basd on sound logic and
acceptable in general, is poetically represented, it is known as Aitihya.
eg 1. kalyāṇī bata gātheyaṃ laukikī pratibhāti me.
eti jīvantamānando naraṃ varṣaśatādapi.

कल्याणी बत गाथेयं लौकिकी प्रतिभाति मे ।
एति जीवन्तमानन्दो नरं वर्षशतादपि ॥

This agreeable maxim, to me like a common one, appears--
That joy of living clings to a person even up to hundred years.
 
Definitions
 
अष्टौ प्रमाणालंकारा प्रत्यक्षप्रमुखाः क्रमात् । कु. १३१
 
<headword>कल्पितोपमा</headword>
 
कल्पितोपमा Kalpitopamā : Extended Simile :
 
It is kalpita upamā ie a simile based on poetic imagination. Though
it is accepted as a variety of simile by the older rhetoricians
Vāmana and Rudraṭa have accepted it as a separate figure.
According to them, in Upamā (Simile) there should be total and
qualitative similitude between two or more things, but when there
is similarity due to any special quality or qualities the figure of
speech is called Kalpitopamā.
 
eg 1. caturāsya patir lakṣmyāḥ
sarvajñas tvaṃ mahīpate.

चतुरास्यपतिर्लक्ष्म्याः सर्वज्ञस्त्वं महीपते ।

The four-mouthed God is the Lord of prosperity (Lakṣmī).
While thou art, O king, the omniscient divinity.
 
Mythically Brahmā is conceived as the four-mouthed deity who
has acquired all sorts of knowledge of spiritualism and hence he is
known as the Omniscient One. But here the poet eulogises the
king referred to here as the omniscient of all mortals though he is
not as divine as the four-mouthed God.
 
Definition
 
गुणबाहुल्यतश्च कल्पिता । का सू. ४.२.३