Copy-paste this empty template. Explanations of the parameters is given below

{{Infobox medieval text
<!----------Name---------->
| name                  = 
| alternative title(s)  = 
<!----------Image---------->
| image                 = 
| width                 = 
| caption               = 
<!----------Information---------->
| full title            = 
| also known as         = 
| author(s)             = 
| ascribed to           = 
| compiled by           = 
| illustrated by        = 
| patron                = 
| dedicated to          = 
| audience              = 
| language              = 
| date                  = 
| date of issue         =  
| provenance            = 
| state of existence    = 
| authenticity          = 
| series                = 
| manuscript(s)         = 
| MS class 1            = 
| MS class 2            = 
| MS class 3            = 
| MS class 4            = 
| MS class 5            = 
| MS class 6            = 
| MS class 7            = 
| MS class 8            = 
| MS class 9            = 
| MS class 10            = 
| principal manuscript(s)= 
| first printed edition = 
<!----------Form and content---------->
| verse form            = 
| length                = 
| illustration(s)       = 
| genre                 = 
| subject               = 
| setting               = 
| period covered        = 
| personages            = 
| personages (long list)= 
| sources               = 
| below                 = 
}}

Parameter description

change
{{{name}}}
{{{alternative title(s)}}}
[[File:{{{image}}}|{{{width}}}]]
{{{caption}}}
Full title{{{full title}}}
Also known as{{{also known as}}}
Author(s){{{author(s)}}}
Ascribed to{{{ascribed to}}}
Compiled by{{{compiled by}}}
Illustrated by{{{illustrated by}}}
Patron{{{patron}}}
Dedicated to{{{dedicated to}}}
Audience{{{audience}}}
Language{{{language}}}
Date{{{date}}}
Date of issue{{{date of issue}}}
Provenance{{{provenance}}}
State of existence{{{state of existence}}}
Authenticity{{{authenticity}}}
Series{{{series}}}
Manuscript(s){{{manuscript(s)}}}
{{{MS class 1}}}
{{{MS class 2}}}
{{{MS class 3}}}
{{{MS class 4}}}
{{{MS class 5}}}
{{{MS class 6}}}
{{{MS class 7}}}
{{{MS class 8}}}
{{{MS class 9}}}
{{{MS class 10}}}
Principal manuscript(s){{{principal manuscript(s)}}}
First printed edition{{{first printed edition}}}
Genre{{{genre}}}
Verse form{{{verse form}}}
Length{{{length}}}
Subject{{{subject}}}
Setting{{{setting}}}
Period covered{{{period covered}}}
Personages{{{personages}}}
{{{personages (long list)}}}
Sources{{{sources}}}
{{{below}}}
{{Infobox medieval text
<!----------Name---------->
| name                 = Title of text
| alternative title(s) = title in English or in the original language; non-English title in appropriate (e.g. Greek) script.
                         Alternative titles which do not belong here can be entered in the title fields of the main body below. 

<!----------Image---------->
| image                = "file:example.jpg", image appropriate to the text. 
| width                = image width is set at 225px by default, but may be adjusted if appropriate.
| caption              = brief description of image

<!----------Information---------->
| full title           = full title
| also known as        = alternative titles which do not belong in the subheader
| author(s)            = author(s) of the text (not be confused with scribe(s)). 
| ascribed to          = ascribed author, if the case for authorship rests on a medieval authority, 
                         but is not universally acknowledged by modern scholars.
| compiled by          = the medieval person (often a scribe or the scribe's master) responsible for compiling and arranging the text
| illustrated by       = medieval illustrator. Please also indicate the relevant manuscript(s).
| patron               = patron (who may or may not be addressed in the text)
| dedicated to         = dedicatee (who may or may not be the same person as the patron)
| audience             = audience of the text (intended or not), if sufficiently known and noteworthy, 
                         e.g. the nuns addressed in Aldhelm's ''De Laude Virginitatis''. 
| language             = language(s) used by the text, e.g. Middle High German, Old Norse, Hiberno-Latin, etc.
| date                 = (approximate) date of composition, or date range
| date of issue        = date when a law was promulgated, charter issued, etc. 
| provenance           = place of origin, e.g. region or monastic house
| state of existence   = if appropriate, mark as hypothetical, fictitious or legendary; fragmentary or incomplete.
| authenticity         = spurious or fabricated
| series               = series of which the text is part
| manuscript(s)        = list of manuscripts
| MS class 1           = additional fields using the full box width, intended for more extensive information on manuscripts
| MS class 2           = 
| MS class 3           = 
| MS class 4           = 
| MS class 5           = 
| MS class 6           = 
| MS class 7           = 
| principal manuscript(s) = principal manuscript
| first printed edition = first printed edition

<!----------Form and content---------->
| verse form           = prosodic features, rhyme, alliteration, etc. 
| length               = number of words, lines, folios, etc.
| illustration(s)      = brief description of medieval illustration(s)
| genre                = genre or text type
| subject              = brief description of subject or theme(s)
| setting              = setting, such as period and locale; usually for literature
| period covered       = (approximate) period. For historical works, one may want to specify the years covered by the entries, 
                         e.g. for ''Annals of Tigernach'', AD 34-378 (Dublin fragment); AD 142-361 (2nd fragment), etc.
| personages           = (leading) characters in a literary text, or historical personages
| personages (long list)  = additional fields using the full box width, intended for longer lists of personages
| sources              = source(s) from which the text or compilation is derived
| below                = text in bottom cell, intended for footnotes, see-also, and other such information.
}} 

Example

change
Hemming's Cartulary
Liber Wigorniensis and Hemming's Cartulary proper
Page from Hemming's Cartulary, this is folio 121 of the manuscript
Author(s)Hemming (2nd part)
Compiled byHemming (2nd part)
Languagemedieval Latin
Datemostly 996 x 1016 (Liber Wigorniensis); late 11th / early 12th century (2nd part)
ProvenanceWorcester Cathedral
Authenticitycontains some spurious charters
Manuscript(s)Cotton Tiberius A xiii
First printed edition1723 by Thomas Hearne
GenreCartulary
SubjectCharters of Worcester Cathedral
Period covered10th and 11th century
PersonagesCnut, William the Conqueror, others
{{Infobox medieval text
<!----------Name---------->
| name                 = ''Hemming's Cartulary''
| alternative title(s) = ''Liber Wigorniensis'' and Hemming's Cartulary proper
| image                = File:Hemmingscartfolio121.jpg
| width                = 
| caption              = Page from Hemming's Cartulary, this is folio 121 of the manuscript

<!----------Information---------->

| author(s)            = Hemming (2nd part)
| compiled by          = Hemming (2nd part)
| patron               = 
| dedicated to         = 
| audience             =  
| language             = medieval Latin
| date                 = mostly 996 x 1016 (''Liber Wigorniensis''); late 11th / early 12th century (2nd part)
| provenance           = [[Worcester Cathedral]]
| authenticity         = contains some spurious charters
| first printed edition = 1723 by [[Thomas Hearne (antiquarian)|Thomas Hearne]]
| manuscript(s)        = Cotton Tiberius A xiii

<!----------Form and content---------->
| genre                = [[Cartulary]]
| subject              = [[Charter]]s of [[Worcester Cathedral]]
| setting              = 
| period covered       =  10th and 11th century
| personages           = [[Cnut]], [[William the Conqueror]], others
}}